JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Xiaofang Ma,Jing Chen,Yali Wu,Samrat Devaramani,Xiaoyan Hu,Qixia Niu,Caizhong Zhang,Duoliang Shan,Huan Wang,Xiaoquan Lu
The RGO/AuNPs/CS/ZnTCPP nanocomposites were successfully prepared with reduced graphene oxide (RGO) loaded with Au nanoparticles (AuNPs) existed in chitosan (CS) and water-soluble zinc meso-tetra (4-carboxylphenyl) porphyrin (ZnTCPP) by π-π nanoassembly method and were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), 1 H NMR spectra and UV–vis absorption spectroscopy. The most important advantage of the RGO/AuNPs/CS/ZnTCPP nanocomposites was environmentally friendly. Indium tin oxide (ITO) electrode surface was modified with the RGO/AuNPs/CS/ZnTCPP nanocomposites exhibited a good photocurrent response at −0.2 V under whitelight of Xenon lamp illumination. The photocurrent response could be greatly increased by adding hydroquinone (HQ) to the solution. Electrons of ZnTCPP were excited from HOMO to LUMO by irradiating light. The photoexcited electrons injected into the RGO , and then transferred to AuNPs further to the ITO. Addition of HQ resulted in the enhanced photocurrent signal by acting as a sacrificial electron donor ; Thereby scavenged the photogenerated holes of the excited ZnTCPP and oxidized to benzoquinone (BQ). Based on the above interaction, detection of HQ was developed by a novel photoelectrochemical (PEC) sensor (S/N = 3) with a linear range from 5 to 300 nmol/L (r = 0.997) and detection limit of 0.5 nmol/L. Proposed biosensor is simple, rapid and this was successfully applied for the quantification HQ in the real sample matrices.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 21
·17644-17651
·
IF 3.201
Shaobo Li,Tao Zhu,Lichun Dong,Mingdong Dong
Heteroatom doping has been demonstrated to be an effective way to tune the properties of nanomaterials including chemical reactivity and electronic and optical performance. In this study, rGO/g-C3N4 and boron doped rGO/g-C3N4 (B-rGO/g-C3N4) nanocomposites were fabricated via a rapid plasma treatment method, and their photocatalytic performance under visible light radiation was examined. The results showed that the photocatalytic efficiency of B-rGO/g-C3N4 for rhodamine B degradation can be 50% higher than that of rGO/g-C3N4 at an optimum rGO loading of 5 wt%. XPS and FTIR analyses indicated the enhanced C–O–C covalent bonding between rGO and g-C3N4 in B-rGO/g-C3N4, and the optical characterization demonstrated that it could further improve the separation of the photo-generated chargers and narrow the bandgap of the nanocomposite. This work provides an idea that boron doping could be an effective way to promote the chemical interaction between different components in composite materials, which is important in designing and developing new functional nanomaterials.
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高影响因子
ACS Omega
·
2018
·
IF 0
Yizhi Wang,Shuo Wang,Fan Li,Yan Wang,Huairuo Zhang,Chunwen Sun
Highly active and durable electrocatalysts are vital for commercialization of direct methanol fuel cells. In this work, a three-dimensional nanocomposite consisting of platinum nanoparticles, W18O49 nanocables, and reduced graphene oxide composite (Pt/W18O49 NCs–rGO) has been prepared as an electrocatalyst for methanol oxidation reaction (MOR). The catalyst is prepared through a two-step method. The W18O49 nanocables and the reduced graphene oxide composite are prepared by a solvothermal process. Then, Pt nanoparticles are loaded on the W18O49 nanocables and the reduced graphene oxide composite by a hydrogen reduction at ambient condition. The obtained catalyst has a special three-dimensional architecture consisting of two-dimensional nanosheets, assembled one-dimensional nanocables, and the loaded nanoparticles on their surface. The Pt/W18O49 NCs–rGO catalyst shows 1.56 time mass activities than the Pt/C, with the current density of the forward anodic peak reaching 1624 mA/mgPt at 0.854 V versus reversible hydrogen electrode potential in 0.1 M HClO4 and 0.5 M CH3OH mixed electrolyte. It also shows a strong antipoisoning property toward CO. For the durability testing, the current density of Pt/W18O49 NCs–rGO shows a 37% decay, whereas the current of Pt/C catalyst shows a 41% degradation from 600 to 3600 s at 0.7 V. The high activity toward MOR, good antipoisoning for intermediate products, and excellent stability are ascribed to strong metal–support interaction effects between the Pt nanoparticles and the W18O49 NCs.
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PubMed
Nanomaterials
·
2018
·Vol. 8
·期 11
·909
·
IF 3.504
Zikai Jiang,Weigen Chen,Lingfeng Jin,Fang Cui,Zihao Song,Chengzhi Zhu
The development of functionalized metal oxide/reduced graphene oxide (rGO) hybrid nanocomposites concerning power equipment failure diagnosis is one of the most recent topics. In this work, WO3nanolamellae/reduced graphene oxide (rGO) nanocomposites with different contents of GO (0.5 wt %, 1 wt %, 2 wt %, 4 wt %) were synthesized via controlled hydrothermal method. X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetric analyses-derivative thermogravimetric analysis-differential scanning calorimetry (TG-DTG-DSC), BET, and photoluminescence (PL) spectroscopy were utilized to investigate morphological characterizations of prepared gas sensing materials and indicated that high quality WO3nanolamellae were widely distributed among graphene sheets. Experimental ceramic planar gas sensors composing of interdigitated alumina substrates, Au electrodes, and RuO2heating layer were coated with WO3nanolamellae/reduced graphene oxide (rGO) films by spin-coating technique and then tested for gas sensing towards multi-concentrations of acetylene (C2H2) gases in a carrier gas with operating temperature ranging from 50 °C to 400 °C. Among four contents of prepared samples, sensing materials with 1 wt % GO nanocomposite exhibited the best C2H2sensing performance with lower optimal working temperature (150 °C), higher sensor response (15.0 toward 50 ppm), faster response-recovery time (52 s and 27 s), lower detection limitation (1.3 ppm), long-term stability, and excellent repeatability. The gas sensing mechanism for enhanced sensing performance of nanocomposite is possibly attributed to the formation of p-n heterojunction and the active interaction between WO3nanolamellae and rGO sheets. Besides, the introduction of rGO nanosheets leads to the impurity of synthesized materials, which creates more defects and promotes larger specific area for gas adsorption, outstanding conductivity, and faster carrier transport. The superior gas sensing properties of WO3/rGO based gas sensor may contribute to the development of a high-performance ppm-level gas sensor for the online monitoring of dissolved C2H2gas in large-scale transformer oil.Keywords:WO3nanolamellae;reduced graphene oxide;acetylene sensing performance;gas sensing mechanism;dissolved gases in transformer oil
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PubMed
高影响因子
TALANTA
·
2014
·
IF 3.511
Qing Han,Xi Wang,Zaiyue Yang,Wanying Zhu,Xuemin Zhou,Huijun Jiang
Based on magnetic field directed self-assembly (MDSA) of Fe 3 O 4 @rGO composites, a novel magnetic molecularly imprinted electrochemical sensor (MIES) was fabricated and developed for the determination of the azo dye amaranth . Fe 3 O 4 @rGO composites were obtained by a one-step approach involving the initial intercalating of iron ions between the graphene oxide layers via the electrostatic interaction , followed by the reduction with hydrazine hydrate to deposit Fe 3 O 4 nanoparticles onto the reduced oxide graphene nanosheets . In molecular imprinting, the complex including the function monomer of aniline, the template of amaranth and Fe 3 O 4 @rGO was pre-assembled through π–π stacking and hydrogen bonding interactions, and then was self-assembled on the surface of magnetic glassy carbon electrode (MGCE) with the help of magnetic field induction before electropolymerization. The structures and morphologies of Fe 3 O 4 @rGO and the doped molecularly imprinted polymers (MIPs) were investigated by Fourier transform infrared spectrometer (FT-IR), Raman spectra and scanning electron microscope (SEM). Besides, the characterization by differential pulse voltammetry (DPV) showed that Fe 3 O 4 @rGO composites promoted the electrical conductivity of the imprinted sensors when doped into the MIPs. The adsorption isotherms and adsorption kinetics were employed to evaluate the performances of MIES. The detection of amaranth was achieved via the redox probe K 3 [Fe(CN) 6 ] by blocking the imprinted cavities, which avoided the interferences of oxidation products and analogs of amaranth. Furthermore, the prepared MIES exhibited good sensitivity, selectivity, reproducibility and efficiency for detecting amaranth in fruit drinks. The average recoveries were 93.15–100.81% with the RSD <3.0%.
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PubMed
高影响因子
WATER AIR AND SOIL POLLUTION
·
2015
·Vol. 226
·期 11
·1-12
·
IF 1.554
Ahmad Ayyaz,Gu Xiaogang,Li Li,Lu Shuguang,Xu Yisheng,Guo Xuhong
In this study, nanosized zero-valent iron-reduced graphene oxide (nZVI-rGO)-activated persulfate (PS) was used to investigate the generation of reactive oxygen species (ROS) for the degradation of trichloroethylene (TCE) in the aqueous solution. More than 98 % of TCE was degraded within 2 min under experimental conditions. The generation of ·OH increased when the pH was shifted toward the basic region while ·SO 4
− radicals’ intensity increased in the acidic pH. Different scenarios have been observed in ·O 2
− generation in the neutral and strong basic pH and decreased in acidic or slightly basic pH. In addition, the intensity of ·OH was increased with the addition of HCO 3
− (10 mM) and NO 3
− (100 mM) but decreased in the presence of Cl − (10 and 100 mM), HCO 3
− (100 mM), and NO 3
− (10 mM). The degradation of anisole, probe for both ·OH and ·SO 4
− , was slightly enhanced by 10 mM NO 3
− anions but decreased in 100 mM salt solution. ·O 2
− intensity was increased while HCO 3
− (10 and 100 mM) and NO 3
− (100 mM) anions were used. nZVI-rGO-activated PS process could remove TCE in aqueous effectively, and the ROS generation and intensity were influenced by solution pH values and anions.
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Nanoscale
·
2016
·Vol. 8
·期 22
·11531-11542
·
IF 7.76
Ruixia Dou,Zhen Du,Tao Bao,Xinghua Dong,Xiaopeng Zheng,Miao Yu,Wenyan Yin,Binbin Dong,Liang Yan,Zhanjun Gu
Recently, a combination of chemotherapy with photothermal therapy (PTT) has received great attention for the construction of a near infrared (NIR)-controlled drug-delivery system for synergistic treatment of cancer, ultimately resulting in the enhancement of the therapeutic efficacy of anticancer drugs. Here, we developed a novel system for synergistic cancer therapy based on bismuth sulfide (Bi2S3) nanoparticle-decorated graphene functionalized with polyvinylpyrrolidone (PVP) (named PVP-rGO/Bi2S3). The as-prepared PVP-rGO/Bi2S3 nanocomposite has a high storage capacity for anticancer drugs (∼500% for doxorubicin (DOX)) and simultaneously has perfect photothermal conversion efficiency in the NIR region. The results of the in vitro accumulative drug release test manifests that the PVP-rGO/Bi2S3 nanocomposite could be applied as a dual pH- and NIR-responsive nanotherapeutic carrier for the controlled release of DOX from DOX-loaded PVP-rGO/Bi2S3 (PVP-rGO/Bi2S3@DOX). Moreover, the treatment of both cancer cells (including Hela, MCF-7, HepG2 and BEL-7402 cells) and BEL-7402 tumor-bearing mice with the PVP-rGO/Bi2S3@DOX complex followed by NIR laser irradiation produces significantly greater inhibition of cancer cell growth than the treatment with NIR irradiation alone or DOX alone, exhibiting a synergistic antitumor effect. Furthermore, due to the obvious NIR and X-ray absorption ability, the PVP-rGO/Bi2S3 nanocomposite could be employed as a dual-modal contrast agent for both photoacoustic tomography and X-ray computed tomography imaging. In addition to the good biocompatibility, the PVP-rGO/Bi2S3 nanocomposite paves a potential way for the fabrication of theranostic agents for dual-modal imaging-guided chemo-photothermal combined cancer therapy.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 91
·88897-88903
·
IF 3.289
Na Wang,Xiaofeng Li,Jing Yang,Yuxia Shen,Jin Qu,Song Hong,Zhong-Zhen Yu
To enhance the recyclability while maintaining the high efficiency for the removal of organic dyes, monolithic polyurethane@reduced graphene oxide@manganese dioxide (PU@RGO@MnO2) hybrid sponge with a hierarchical structure and satisfactory flexibility is fabricated by self-assembly of RGO on a PU sponge followed by uniform coating of MnO2 nanoparticles onto RGO by means of an in situ redox reaction between RGO and KMnO4. RGO acts as an ideal substrate to accommodate MnO2 nanoparticles and prevents their aggregation, whereas the numerous hydrophilic MnO2 nanoparticles play dual roles of adsorption and catalytic degradation of methylene blue (MB) dye. The resultant hybrid sponge shows a hierarchical porous structure that provides fast transport channels and abundant active sites, benefiting the diffusion and removal of MB. By enhancing the mass transfer with the help of a micro-pump, the monolithic hybrid sponge acts as a filter for dye removal. Under the dynamic mode, the adsorption efficiency of the PU@RGO@MnO2 hybrid sponge for MB (50 ppm, 30 mL) reaches 94% after 20 min, whereas it is as low as 5% under the static mode. With the assistance of H2O2, the removal efficiency of the hybrid sponge is 96% at first time under the dynamic mode, whereas it is only 14% in the static mode. The monolithic hybrid sponge is highly efficient in adsorption and catalytic degradation of MB based on an adsorption–oxidation–desorption process. Even after being used 4 times, it still maintains excellent removal efficiency and recyclability.
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高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Ya Liu,Yidan Shi,Xiang Liu,Hexing Li
In this paper, novel photocatalyst Bi 2 S 3 /TiO 2 /RGO composites were successfully fabricated by a facile solvothermal method. During this process, TiO 2 was coupled with Bi 2 S 3 to generate Bi 2 S 3 sensitized TiO 2 nanoparticles, and graphene oxide (GO) was reduced to reduced graphene oxide (RGO), which was uniformly covered with plenty of Bi 2 S 3 and TiO 2 . The as-prepared samples were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), specific surface areas (BET), X-ray diffraction (XRD), Fourier transform infrared (FTIR), Raman, X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (UV–vis DRS) and photoluminescence (PL) spectroscopy. The results confirmed that Bi 2 S 3 could act as an optical filter, which could be activated under visible light. And the introduction of Bi 2 S 3 could improve the response of TiO 2 nanoparticles for visible light. In addition, the Bi 2 S 3 /TiO 2 in Bi 2 S 3 /TiO 2 /RGO composites had more uniform dispersion on the surface of graphene with less agglomeration in comparison with the Bi 2 S 3 /TiO 2 . Graphene can provide conductive electron channels for separation of the electrons and inhibit the recombination of electrons and holes. Furthermore, the photocatalytic activity of Bi 2 S 3 /TiO 2 /RGO composites was evaluated through the degradation of methylene blue (MB) under visible light irradiation. The Bi 2 S 3 /TiO 2 /RGO composites showed the highest photocatalytic activity among the referred photocatalysts, with about 3-fold increase in photocatalytic efficiency over TiO 2 nanoparticles. The mechanism of high photocatalytic activity was also discussed.
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高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 48
·18990-19002
·
IF 8.262
Liguang Dou,Hui Zhang
A series of novel hierarchical nanosheet array-like hybrids xCu-LDH/rGO (xCu-LDH: CuxMg3−xAl-layered double hydroxide (x = 0.5, 1.0, and 1.5), rGO: reduced graphene oxide) were assembled via a facile and green aqueous-phase coprecipitation method. Systematic characterization suggests that the hybrids were constructed by hexagonal LDH nanoplates (∼70 nm × 4.5 nm) interdigitated vertical to the surface of single-layer rGO. All the xCu-LDH/rGO hybrids exhibit a remarkable higher activity for catalytic reduction of 4-nitrophenol (4-NP) compared with pure Cu-LDH, commercial Pt/C and other recently reported Cu-related catalysts. These findings were carefully explained by deep study of the catalyst treated with NaBH4, and the xCu-LDH/rGO hybrids as a potential Cu2O reservoir were revealed for the first time. Typically for 1.0Cu-LDH/rGO, a part of Cu2+ ions on LDH layers were instantaneously in situ reduced to well-dispersed ultrafine Cu2O nanoparticles (∼6.8 nm) by NaBH4 in an aqueous reduction system and thus formed relatively strong interaction between Cu2O and LDH/rGO greatly favoring enhanced activity for the reduction of 4-NP, other nitroarenes and organic dyes at room temperature. The excellent activity of the xCu-LDH/rGO hybrids can be attributed to the possible Cu2O–Cu-LDH–rGO three-phase synergistic effect, increased adsorption capacity for reactants via π–π stacking, and unique nanoarray-like morphology of the hybrids. Moreover, the 1.0Cu-LDH/rGO can be cycled for 20 runs without significant loss of activity, giving the hybrid long-term stability.
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高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Liguo Wei,Xiaohu Xu,Lishuang Zhao,Junyun Liu,Run Wang,Xindan Zhang
To improve the photovoltaic performance of the traditional TiO 2 photoanode for dye-sensitized solar cells (DSSCs), a series of layered TiO 2 /rGO composited DSSCs photoanode was assembled by changing the morphologies of the TiO 2 and introducing reduced graphene oxide (rGO) into different areas of the photoanode films. Firstly, TiO 2 nanoflowers (TiO 2 -NFs), TiO 2 nanorods (TiO 2 -NRs) were prepared employing the hydrothermal method and used as photoanode materials to explore the synergistic effect of TiO 2 with different morphologies in layered photoanode. Then, TiO 2 -NFs/rGO composited photoanode (TNF/rGO) were fabricated to research the mechanism of rGO on improving electron transmission in the layered photoanode. The effect of adding rGO at different parts of the layered photoanode on the performance of DSSCs was also investigated. Attributing to the enhancement of light absorption and charge transfer, a champion power conversion efficiency ( η ) of 9.21 % ( J sc = 23.36 mA cm −2 , V oc = 0.74 V, FF = 0.53) was achieved with the layered TiO 2 /rGO composited photoanode containing two consecutive layers of TiO 2 -NFs/rGO and P25/rGO, which exhibited an 82.01 % increase than traditional TiO 2 (pure P25) photoanode ( η = 5.06 %, J sc = 12.09 mA cm −2 , V oc = 0.73 V, FF = 0.58). It is an effective way to design and fabrication of layered TiO 2 /rGO composited photoanode to regulate the photovoltaic performance of traditional TiO 2 photoanode for DSSCs based on the synergistic effect of its multi-layer structure, TiO 2 morphologies and introduction of rGO.
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高影响因子
MRS Energy & Sustainability
·
2024
·
IF 3.3
Oubla M’hamed,Idrissi Siham,Edfouf Zineb,Dinia Selma,Elouadi Brahim
Abstract The growing request of enhanced lithium-ion battery (LIB) anodes performance has driven extensive research into transition metal oxide nanoparticles, notably Fe 3 O 4 . However, the real application of Fe 3 O 4 is restricted by a significant fading capacity during the first cycle, presenting a prominent challenge. In response to this obstacle, the current research centers on the development of Fe 3 O4@rGO (with rGO is reduced graphene oxide) nanocomposite through a new two-step soft sol–gel method, incorporating a slight proportion of rGO. This targeted approach aims to resolve issues linked to the electrochemical stability of Fe 3 O 4 anode. The structure and morphological characterizations techniques confirmed the spinel crystalline structure of Fe 3 O 4 as well as the distinctive aggregate morphology of the nanoparticles, highlighting a regular arrangement of rGO-coated nanoparticles. The lithium-ion storage properties of the Fe 3 O 4 @rGO anode were examined through exhaustive electrochemical analyses. A minor irreversible capacity stands out as a particularly noteworthy feature in the Fe 3 O 4 @rGO anode. This characteristic is of paramount interest, given that the anode exhibits high specific capacity along with a high cycling stability and an outstanding rate capability. These remarkable outcomes can be directly linked to the superior morphological characteristics attained through the two-step sol–gel method. Graphical Abstract
Highlights
The Fe 3 O 4 @rGO nanocomposite, resulting from a novel two-step mild sol–gel method, exhibits a unique and promising structure for LIB technologies.
Regarding storage performance as an anode, the prepared nanocomposite exhibited a minor irreversible capacity, high reversible capacity, as well as good coulombic efficiency.
The incorporation of rGO improved the electrical conductivity and played a crucial role in facilitating Li-ion diffusion, overcoming challenges associated with volume changes during the cycling process.
Discussion
Transition metal oxide (TMO)-based anodes hold promise for future LIB technologies owing to their substantial theoretical capacities. However, the material’s tendency to expand dramatically during use, leading to electrode deterioration and capacity fade. To address this challenge, researchers have explored incorporating rGO into TMO composites.
rGO’s unique properties, including high conductivity and mechanical flexibility, effectively mitigate volume expansion and enhance electrochemical performance. The two-step soft sol–gel method could be a promising solution for fabricating rGO-TMO nanocomposites. However, further optimization and large-scale fabrication are necessary for practical applications.
Despite these challenges, the combination of TMOs and rGO could create high-performance and durable anodes for LIB. Further research should focus on optimizing material composition and fabrication processes to realize the full potential of this technology.
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