SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Xiaoqing Zhao,Jing Wang,Hou Chen,Hui Xu,Liangjiu Bai,Wenxiang Wang,Huawei Yang,Donglei Wei,Baiqing Yuan
A novel electrochemical immunoassay platform for multi-signal amplification has been constructed and applied to the simultaneous detection of three tumor markers (TMs). The platform was successfully developed by polyethyleneimine (PEI)-polydopamine (PDA)/reduced graphene oxide (rGO) nanocomposites. PDA/rGO as the substrates can simultaneously load with detection antibodies (Ab 2 ) and large amounts of PEI, which PEI were further used to immobilize different signal labels. Three TMs of carcinoembryonic antigen (CEA), prostate specific antigen (PSA) and alpha fetoprotein (AFP) were employed as potential factors. Ferrocenecarboxylic acid (Fc), anthraquinone-2-carboxylic acid (Aq) and acetylsalicylic acid (ASA) were employed as distinguishable signal labels. Electrochemical responses of designed sandwich-type immunosensor were successfully investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The multiplexed immunoassay displayed excellent linear response in the range of 0.102 pg/mL–112 ng/mL for CEA and PSA, 0.117 pg/mL–117 ng/mL for AFP. The detection limit of three TMs were 91 fg/mL, 101 fg/mL and 83 fg/mL for CEA, PSA and AFP, respectively. Moreover, this electrochemical immunoassay platform exhibited excellent reproducibility, sensitivity and selectivity for the simultaneous detection of multiple biomarkers.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Gege Yu,Jianfei Xia,Feifei Zhang,Zonghua Wang
A hierarchical and hybrid nanocomposite of reduced graphene oxide/zeolitic imidazolate framework-8 (RGO/ZIF-8) has been successfully fabricated by the RGO as template for the in situ growth of ZIF-8. The morphology and structure of the resulted RGO/ZIF-8 nanocomposite were characterized by using scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was demonstrated that ZIF-8 nanoparticles anchored and grew well on the surfaces of RGO. The electrocatalytic activity of the RGO/ZIF-8 towards the dopamine (DA) was investigated using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results demonstrated the fabricated RGO/ZIF-8 sensor exhibited high sensitivity for the determination of DA, owing to the synergistic effect from highly electrical conductivity of RGO and porosity of ZIF-8. Under the optimal conditions, the linear response range for DA was from 1.0 × 10 − 7 to 1.0 × 10 − 4 mol L − 1 and the detection limit of DA was estimated to be as low as 3 × 10 − 8 mol L − 1 . Moreover, the prepared electrochemical sensor also showed excellent selectivity for DA detection in the presence of ascorbic acid (AA) and prospective results in real samples detection.
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SENSORS
·
2017
·Vol. 17
·期 10
·2415
·
IF 2.677
Hui Yang,Qiangqiang Ye,Ruixue Zeng,Junkai Zhang,Lei Yue,Ming Xu,Zhi-Jun Qiu,Dongping Wu
In this paper, capacitive-type humidity sensors were prepared by sequentially drop-coating the aqueous suspensions of zinc oxide (ZnO) nanopowders and polyvinyl pyrrolidone–reduced graphene oxide (PVP-RGO) nanocomposites onto interdigitated electrodes. Significant improvements in both sensitivity and linearity were achieved for the ZnO/PVP-RGO sensors compared with the PVP-RGO/ZnO, PVP-RGO, and ZnO counterparts. Moreover, the produced ZnO/PVP-RGO sensors exhibited rather small hysteresis, fast response-recovery time, and long-term stability. Based on morphological and structural analyses, it can be inferred that the excellent humidity sensing properties of the ZnO/PVP-RGO sensors may be attributed to the high surface-to-volume ratio of the multilayer structure and the supporting roles of the PVP-RGO nanocomposites. The results in this work hence provide adequate guidelines for designing high-performance humidity sensors that make use of the multilayer structure of semiconductor oxide materials and PVP-RGO nanocomposites.Keywords:ZnO nanopowders;RGO;PVP;capacitive humidity sensor
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高影响因子
Environmental Chemistry Letters
·
2017
·Vol. 16
·期 1
·251-264
·
IF 3.594
Yein Win Thi,Wang Qun,Feng Xueying,Li Yang,Wu Xiaohong
Nanocomposites composed of two or more components with desirable performance have attracted tremendous attention, mainly due to the synergic effect between the components. The effective combination of ZnO and reduced graphene oxide would lead to ameliorate the photocatalytic performance. To enhance applicability of semiconductor photocatalytic, the composites used should be good interfacial contact governed by suitable particle size distribution. Herein we aim to fabricate the different crystallize size of ZnO nanoparticles (NPs) in ZnO–reduced graphene oxide (ZnO–rGO) nanocomposites by sonochemical synthesis and subsequent facile drying treatment method. The Zn precursor, Zn(Ac) 2 , with a plenty of functional groups, was used as a starting source for both reduction of graphene oxide and formation of ZnO on rGO sheets through chemical bonds without the addition of hazardous reducing agents. LiOH was chosen as an assistive reagent to enhance the complete reaction between Zn(Ac) 2 and GO in the formation of ZnO–rGO nanocomposites. More remarkably, drying condition has the great influence on the crystallize size of ZnO NPs in as-prepared ZnO–rGO nanocomposites. It is found that ZnO–rGO nanocomposites dried at −50 °C (freeze drying) show the highest photocatalytic efficiency in the degradation of rhodamine B (RhB) as compared to ZnO–rGO nanocomposites by other drying conditions under visible-light irradiation. Correlating the crystallize size obtained by different drying temperatures with the photocatalytic activity, it is probed that the smaller crystallize size in ZnO–rGO nanocomposites enhances the interfacial contact and a chemical bonding between rGO and ZnO NPs leading to the effective separation of electrons and holes. In addition, the O
·− 2
anion was determined to be the main active oxidant by free radicals trapping experiment and a photodegradation mechanism of ZnO–rGO nanocomposites over rhodamine B (RhB) was proposed based on our observations.
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Analytical Methods
·
2024
·
IF 2.7
Huyue Wei,Mingzhu Yang,Chengshuai Huang,Xiaojie Yue,Jiabin Cai,Xinyi Wang,Kai Fan,Linxi Dong,Gaofeng Wang,Dujuan Li
Neuron-specific enolase (NSE), a tumor marker of small cell lung cancer (SCLC), has high application value in the early diagnosis of SCLC. In this study, a dual signal electrochemical aptasensor for NSE was constructed based on hemin/reduced graphene oxide/multi-walled carbon nanotube (H–rGO–MWCNT) nanocomposites. Hemin played a dual role, functioning not only as an in situ electrochemical probe but also exhibiting excellent peroxidase-like properties, effectively catalyzing the electroreduction of H2O2. Reduced graphene oxide and multi-walled carbon nanotubes exhibited excellent conductivity. Through their binding with hemin, the nanocomposites achieved a larger specific surface area, providing numerous active sites for capturing the NSE aptamer. In the presence of NSE, the specific adsorption between the antigen and the aptamer formed a stable antigen–aptamer structure, which inhibited the performance of hemin, resulting in the weakening of the electrochemical signals of hemin and H2O2. Leveraging these characteristics, the sensitive and cost-effective dual-signal electrochemical aptasensor has been fabricated for the detection of NSE. One signal corresponded to differential pulse voltammetry (DPV) of hemin, while the other signal was derived from chronoamperometry, capturing the catalytic reduction of H2O2. The linear ranges for NSE were 1 pg mL−1 to 1 μg mL−1 and 100 pg mL−1 to 100 ng mL−1 with the limit of detection (LOD) of 0.21 pg mL−1 and 11.22 pg mL−1 by DPV and chronoamperometry, respectively. In addition, this aptasensor exhibited good reproducibility, stability and specificity. The recovery of NSE in human blood serum samples was from 89% to 131%. It provided a promising strategy for the detection of NSE in clinical diagnostics.
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Inorganic Chemistry Frontiers
·
2017
·Vol. 4
·期 6
·935-945
·
IF 4.036
Jiantao Feng,Yechen Wang,Yanhui Hou,Liangchao Li
A series of yolk–shell ZnFe2O4@reduced graphite oxide@TiO2 (ZFO@RGO@TiO2) microspheres with different void sizes and TiO2 shell thicknesses has been successfully synthesized by combining a layer-by-layer coating process and chemical etching route. Compared to pure ZFO and hierarchical ZFO@SiO2@RGO@TiO2, the as-synthesized yolk–shell microspheres exhibited significantly enhanced microwave absorption properties in terms of effective bandwidth and reflection loss. Among these, the minimum reflection loss of the as-synthesized yolk–shell microspheres with a thickness of 2.6 mm could reach up to −44.3 dB at 15.92 GHz, and their effective absorption bandwidth at less than −10 dB was 4.1 GHz. In addition, as the shell thickness of the yolk–shell microspheres decreased, the frequency corresponding to the minimum reflection loss shifted to the high-frequency range. Hence, these obtained yolk–shell microspheres are potential new candidates for high-frequency shielding and lightweight microwave absorbing materials.
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RSC Advances
·
2016
·Vol. 6
·期 70
·65443-65449
·
IF 3.289
Yan Zhang,Xing-jin She,Cai-Feng Wang,Su Chen
We report a simple and facile strategy for fabricating RGO-g-SSS/CdTe graphene/quantum dot nanocomposites via electrostatic interactions at room temperature. Firstly, sodium p-styrenesulfonate (SSS) was successfully grafted on the reduced graphene oxide (RGO) surface via in situ free radical polymerization. Then, through the electrostatic interactions between positively charged amino groups of CdTe QDs and negatively charged sulfonic acid groups of the RGO-g-SSS surface, we have successfully fabricated RGO-g-SSS/CdTe nanocomposites. We have systematically analysed the structures and photoluminescence behaviors of RGO-g-SSS/CdTe nanocomposites. Finally, by virtue of their special electronic properties, we extended the as-prepared RGO-g-SSS composites as an excellent conductive scaffold to employ in quantum dot sensitized solar cells. These RGO-g-SSS/CdTe hybrids present enhanced optoelectronic properties compared with the pure CdTe QDs, especially in power conversion efficiency, indicating an improvement of 56%.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Yukun Wang,Hanyin Zhang,Renzong Hu,Jiangwen Liu,Teunis van Ree,Haihui Wang,Lichun Yang,Min Zhu
A ternary composite of Fe 3 O 4 /SnO 2 /rGO has been synthesized via a facile one-step hydrothermal method . In the composite, rGO serves as a conductive and robust matrix, Fe 3 O 4 and SnO 2 nanoparticles are uniformly loaded on the rGO nanosheets without aggregation, due to the space-confine effect of the simultaneous nucleation and growth of Fe 3 O 4 and SnO 2 nanocrystallites . As an anode material for lithium-ion batteries, the Fe 3 O 4 /SnO 2 /rGO nanocomposite exhibited a reversible capacity of 947 mAh g −1 at a current density of 200 mA g −1 in the first cycle, and maintained 831 mAh g −1 after 200 cycles. The cyclic performance and rate capability of the Fe 3 O 4 /SnO 2 /rGO are markedly improved compared with the binary counterparts of FeO x /rGO and SnO x /rGO obtained in the control experiment, as a result of enhanced structural stability and kinetics for charge and Li + transfer due to the synergetic effect in the ternary composite.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Wenjun Liu,Jingyu Cai,Zhengxin Ding,Zhaohui Li
TiO 2 /RGO composite aerogels with TiO 2 nanostructures grown on interconnected three-dimensional RGO porous networks were fabricated via a facile one-pot hydrothermal method. The as-obtained composite aerogels show controllable and continuously tunable surface wettability from super-hydrophobic to super-hydrophilic depending on the amount of incorporated TiO 2 . The TiO 2 /RGO composite aerogels with varied surface wettability can selectively degrade different pollutants in aqueous systems. The capability of forming the TiO 2 /RGO aerogels with tunable surface wettability for selective photocatalysis is important since such materials are especially useful in some systems which contain extremely poisonous contaminants in low concentration together with large quantity of un-poisonous chemicals.
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LANGMUIR
·
2024
·
IF 3.7
Wenshuai Jiang,Yaning Wang,Yuxi Wang,Wen Zhou,Jiefen Shen,Qingjun Liu
Nanocomposite films made from graphene oxide (GO) and MXene have a dense layered structure due to nanosheet self-stacking, limiting their dye adsorption performance. In this study, acid–base neutralization reactions are used to induce MXene/reduced graphene oxide (RGO) films bulging, which opens the stacked layer structure within the membrane and enhances MB adsorption performance. The effects of the pH, temperature, contact time, and initial concentration of MB on the adsorption performance are further investigated. The results indicate that the adsorption process conforms to the pseudo-second-order kinetic and Freundlich isotherm models and is heat-absorbing and spontaneous, and the MXene/RGO foams have an adsorption capacity of up to 1099.5 mg g–1 for MB. In addition, our study show that the MXene/RGO foams not only have better reusability, but also exhibit better adsorption for other dyes. The efficient MB removal is attributed to the increased specific surface area of the composite foams, increased active sites, strong electrostatic interactions between MB and the composite foams, as well as intercalation adsorption. These findings offer new options for solving dye effluent problems.
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LANGMUIR
·
2024
·
IF 3.7
Qiaomei Sun,Pengjun Duan,Wenqing Zhang,Yuxuan Xie,Xiang Ni,Jianzhong Zheng
Photocatalytic technology is an attractive option for environmental remediation because of its green and sustainable nature. However, the inefficient utilization of solar energy and powder morphology currently impede its practical application. Here, we designed a floatable photocatalyst by anchoring 0D Cu2(OH)PO4 (CHP) nanoparticles on 2D graphene to construct 0D/2D CHP/reduced graphene oxide (rGO) aerogels. The CHP/rGO aerogels have interconnected mesopores that provide a large surface area, promoting particle dispersion and increasing the number of active sites. Moreover, the optical response of the CHP/rGO aerogel has been significantly expanded to cover the full spectrum of the solar light. Notably, the 20%CHP/rGO aerogel displayed a high degradation rate (k = 0.178 min–1) taking methylene blue (MB) as a model pollutant under light irradiation (λ > 420 nm). The enhanced photocatalytic activity is ascribed to the rapid electron transfer in the CHP/rGO heterostructures, as supported by the DFT theoretical calculations. Our research highlights the utilization of full spectrum responsive photocatalysts for the elimination of organic pollutants from wastewater under solar light irradiation, as well as the potential for catalyst recovery using floatable aerogels to meet industrial requirements.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Ruling Wang,Zhiwei Cai,Hong Zhu,Lei Wang,Yindong Tan,Zening Zhu,Hanping He,Yunbin He,Gang Chang
Nitrite is commonly found in the environment, but its overuse and potential toxicity pose serious health risks. There is a strong need to develop robust and reliable methods for detecting nitrite. Herein, a novel In 2 O 3 solution-gated electrochemical transistor (SGET) nitrite sensor was designed and fabricated for highly sensitive detection of nitrite. Different thicknesses of In 2 O 3 thin films were prepared by sol–gel method, which were used as the channel of transistors and optimized through evaluating the electronic and electrochemical properties. To improve the catalytic oxidation of nitrite, PtAu 4 nanoparticles modified reduced graphene oxide nanocomposites (PtAu 4 /RGO) were fabricated on the gate of transistors through electrodeposition approach. The developed sensor exhibited exceptional sensing performance in nitrite detection, which featured with low detection limit (0.1 nM nitrite) and ultra-wide linear range from 0.1 nM to 1 mM. The developed In 2 O 3 SGET sensor displayed excellent stability and high resistance to common interfering ions, thereby demonstrating superior anti-interference performance. Nitrite in real samples of natural lake water has been accurately measured, suggesting that the designed sensor could act as an ideal transducer platform for highly sensitive and selective nitrite detection in food and environmental fields.
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