Journal of Materials Chemistry A
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2018
·Vol. 6
·期 21
·9874-9881
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IF 9.931
Yuchao Wang,Canzhu Wang,Xiangju Song,Minghua Huang,Suresh Kumar Megarajan,Saleem Farooq Shaukat,Heqing Jiang
Solar-driven evaporation based on photothermal membrane has been proved to be promising in the field of fresh water generation, and it is considered as an emerging strategy both in laboratory and in industrial scales. However, further research efforts have to be made on light harvesting and thermal management to improve water evaporation. In this study, an extensive research was carried out to develop a bio-inspired 3D photothermal cone for high-efficiency solar-driven evaporation with minimum light reflection and heat loss to bulk water. The artificial photothermal cone with a polypyrrole (PPy) coating layer was facilely fabricated via chemical vapor deposition polymerization (CVDP). The present 3D cone with a rationally designed conical structure exhibited satisfactory absorbance around 99.2% in the entire solar spectrum, which is comparable with the performances of super-black materials. Additionally, the heat loss has been minimized by elevating the photothermal cone to narrow the contact area between water and the PPy-based cone with good wettability, thus achieving a highly efficient interface heating. The solar conversion efficiency up to 93.8% for evaporation was achieved for the photothermal cone under one sun illumination, which is about 1.7 times as high as the result obtained for a plane film. Based on our results, controlling the 3D morphology can be considered as an important strategy for designing a novel high-efficiency photothermal membrane and also, it provides new opportunities in practical application.
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CHEMICAL PAPERS
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2018
·Vol. 72
·期 9
·2203-2214
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IF 0.963
Sun Qian,Song Xueying,Gao Li,Chen Wei,Li Yamin,Mao Liqun,Yang Jing-He
The series of graphene materials and N-doped graphene materials were successfully synthesized and improved by high-temperature treatment with trace iron oxide. XRD, Raman, FT-IR, TEM and XPS were employed for these catalysts. The catalytic performance of these catalysts was investigated in the selective oxidation of ethylbenzene with tert -butyl hydroperoxide as oxidant. The impacts of temperature, mass of catalysts, reaction time and oxidants on the selective oxidation of ethylbenzene were also investigated. The N-doped graphene materials exhibit greatly remarkable catalytic performance than others. The conversion of ethylbenzene is more than 90% and the selectivity of acetophenone is more than 95% at 353 K. Graphene can be used as catalyst owing to its unique structures and chemical properties. The characterization tests show that the doping of N atoms can create more defects and more active sites in the N-doped graphene materials which could greatly improve the catalytic performance. Furthermore, such cost-effective graphene-based catalysts possess good stability and could be reused at least five times without remarkable loss of the catalytic activity.
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Acta Biomaterialia
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2015
·
IF 6.025
Xuemei Yao,Li Chen,Xiaofei Chen,Zhigang Xie,Jianxun Ding,Chaoliang He,Jingping Zhang,Xuesi Chen
Benefited from the high orientation of coordinated interaction, metallo-supramolecular materials have attracted enormous interest in many fields. Herein, a novel metallo-supramolecular nanogel (SNG)-based drug delivery system for synergistic chemo-photodynamic therapy is explored to enhance anticancer efficacy. It is fabricated by the metallo-supramolecular-coordinated interaction between tetraphenylporphyrin zinc (Zn-Por) and histidine. It can respond to tumor acid microenvironment to release the co-delivered anticancer drug and photosensitizer to kill the lesion cells. Zn-Por moieties in SNG keep the photosensitivity in the range of visible wavelength and possess the ability of generating active oxygen species for photodynamic therapy. The drug-loaded SNG provides a di-functional platform for chemotherapy and photodynamic therapy. Compared with the single chemotherapy of free doxorubicine (DOX) or photodynamic therapy of Zn-Por in SNG, DOX-loaded SNG with irradiation shows higher in vitro cytotoxicity and in vivo anticancer therapeutic activity, endowing the SNG with great potential in cancer treatments. The statement of significance A combination of multiple non-cross-resistant anticancer agents has been widely applied clinically. Applying multiple drugs with different molecular targets can raise the genetic barriers and delay the cancer adaption process. Multiple drugs targeting different cellular pathways can function synergistically, giving higher therapeutic efficacy and target selectivity. Overall, developing a combination therapeutic approach might even be the key to enhance anticancer efficacy and overcome chemo-resistance. Herein, a novel metallo-supramolecular nanogel (SNG) is fabricated by the metallo-supramolecular-coordinated interaction between tetraphenylporphyrin zinc (Zn-Por) and histidine. The DOX-loaded SNG provides a di-functional platform for chemotherapy and photodynamic therapy because it can respond to tumor acid microenvironment to release the co-delivered anticancer drug and photosensitizer to kill the lesion cells.
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RSC Advances
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2014
·Vol. 5
·期 5
·3122-3129
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IF 3.708
Jinjuan Xue,Shuaishuai Ma,Yuming Zhou,Zewu Zhang,Xin Wu,Chenguang She
Novel Ag2O/N-doped helical carbon nanotubes (Ag2O/N–HCNTs) were successfully synthesized via a simple coprecipitation method and were well characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDS). The photocatalytic activities were evaluated in the degradation of methylene blue (MB) aqueous solution. The results showed that Ag2O nanoparticles sized 3–10 nm were highly anchored on the surface and inner tubes of the N–HCNTs support, and significantly enhanced the visible-light photocatalytic activity compared to bare Ag2O. It was attributed to the combined effects, including highly dispersed smaller Ag2O particles and higher charge separation efficiency. The possible mechanism for the photocatalytic activity of Ag2O/N–HCNTs was also tentatively proposed. In particular, the rate of degradation of the as-prepared Ag2O/N–HCNTs was 3.9 times faster than that of using bare Ag2O nanoparticles under visible light irradiation. Furthermore, the Ag2O/N–HCNTs could be easily recycled in visible photocatalytic activity. In addition, the Ag2O/N–HCNTs could also degrade MB dye in different water sources like Changjiang River water and tap water with high efficiency as well as in deionized water and that will greatly promote their application in the area of environmental remediation.
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Materials Research Express
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2014
·Vol. 1
·期 4
·045601
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IF 0
Wenjing Huang,Qingli Hao,Wu Lei,Lihua Wu,Xifeng Xia
An efficient and eco-friendly microwave-assistant method is developed to synthesize a ternary composite of polypyrrole-hemin-reduced graphene oxide (PPY-He-RGO). The polymerization of the pyrrole monomer and the reduction of graphene oxide are performed simply by microwave heating without using a strong reducing or oxidizing agent in an isopropanol/H2O mixed medium. Hemin molecules are immobilized on reduced graphene oxide (RGO) sheets and can still retain high electrocatalytic activity toward the reduction of H2O2 in the final composite. The conducting RGO and polypyrrole with a well-controlled nanostructure provide a highly conductive network to the ternary composite, which can promote the electron transfer between hemin, analytes and electrodes, leading to an improved electrocatalytic activity. The PPY-He-RGO can act as a third-generation mediator and mimic enzyme for the fabrication of a hydrogen peroxide biosensor. The as-prepared PPY-He-RGO electrode exhibits a high sensitivity to H2O2 with a low detection limit of 0.13 μm. The efficient microwave heating provides an opportunity for large-scale production of PPY-He-RGO ternary nanocomposites as a kind of mimic enzyme for biosensors.
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MATERIALS LETTERS
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2014
·
IF 2.269
Hongxia Yang,Nan Wang,Yumei Ren,Lu Cai,Zhimin Chen,Qun Xu
Three-dimensional (3D) graphene-pyrrole/carbon nanotubes/polyaniline (GPCP) nanohybrids were successfully prepared through a facile and scalable method with the assistance of supercritical CO 2 (SC CO 2 ), which could be used as efficient electrode materials for supercapacitors . Our experimental results indicate that SC CO 2 can not only help combining multi-component nanocomposites but also improve the conductivity of the nanohybrids. The electrochemical measurements show that the specific capacitance of the as-prepared nanohybrids with the assistance of supercritical CO 2 can run up to 400 F g −1 , which verify that SC CO 2 provides an effective route to the scalable production of 3D nanohybrids for the potential application in supercapacitors.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
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2015
·Vol. 32
·期 9
·886-892
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IF 3.081
Junyu Lei,Xiaofeng Lu,Guangdi Nie,Ziqiao Jiang,Ce Wang
A facile one-pot synthetic route is reported to prepare algae-like molybdenum disulfide/polypyrrole (MoS 2 /PPy) nanocomposite through a redox reaction between ammonium tetrathiomolybdate and pyrrole monomer under a hydrothermal condition without any other templates. The as-prepared unique algae-like MoS 2 /PPy nanocomposites are composed of few layer MoS 2 nanosheets, which are covered with PPy. Structural and morphological characterizations of this unique nanocomposite are investigated by Fourier-transform infrared spectra, Raman spectra, X-ray diffraction pattern, X-ray photoelectron spectra, energy-dispersive X-ray spectroscopy, and transmission electron microscopy. The as-prepared MoS 2 /PPy nanocomposites exhibit an excellent peroxidase-like catalytic activity toward the oxidation of 3,3,5,5-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide (H 2 O 2 ) in acetate buffer solution (pH 4.0), which provides a facile strategy for the colorimetric detection of H 2 O 2 with a high sensitivity.
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RSC Advances
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2015
·Vol. 5
·期 20
·15096-15102
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IF 3.84
Xin Fan,Zhewei Yang,Nan He
The electrode composites composed of conductive polypyrrole and graphene for electrochemical capacitors have attracted extensive attention due to their potential application. Here a green synthesis method was used to fabricate hierarchical nanostructured polypyrrole/graphene composites by using vitamin C as a reducing agent. The as-prepared nanocomposites were characterized by FTIR, Raman, XRD, TGA, SEM and TEM techniques. The results showed that the polypyrrole chains in the PPy/rGO-CTAB composite successfully inserted into the two-dimensional space of graphene layers. In addition, the electrochemical performances of composites were measured with cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) and electrochemical impedance spectroscopy (EIS) experiments. The results indicated that PPy/rGO-CTAB composites possessed better thermal stability, higher specific capacitance, lower resistance, relatively better cyclic properties and faster response to oxidation/reduction than both PPy/rGO composites without addition of CTAB and rGO.
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ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Wantao Liu,Yanyan Fang,Peng Xu,Yuan Lin,Xiong Yin,Guangshi Tang,Meng He
Polypyrrole/reduced graphene oxide (PPy/RGO) composites on the rigid and plastic conducting substrates were fabricated via a facile two-step electrochemical process at low temperature. The polypyrrole/graphene oxide (PPy/GO) composites were first prepared on the substrate with electrochemical polymerization method, and the PPy/RGO composites were subsequently obtained by electrochemically reducing the PPy/GO. The resultant PPy/GO and PPy/RGO composites were porous, in contrast to the dense and flat pristine PPy films. The cyclic voltammetry measurement revealed that resultant composites exhibited a superior catalytic performance for triiodide reduction in the order of PPy/RGO > PPy/GO > PPy. The catalytic activity of PPy/RGO was comparable to that of Pt counter electrode (CE). Under the optimal conditions, an energy conversion efficiency of 6.45% was obtained for a rigid PPy/RGO-based dye-sensitized solar cell, which is 90% of that for a thermally deposited Pt-based device (7.14%). A plastic counter electrode was fabricated by depositing PPy/RGO composites on the plastic ITO/PEN substrate, and then an all-plastic device was assembled and exhibited an energy conversion efficiency of 4.25%, comparable to that of the counterpart using a sputtered-Pt CE (4.83%) on a plastic substrate. These results demonstrated that electrochemical synthesis is a facile low-temperature method to fabricate high-performance RGO/polymer composite-based CEs for plastic DSCs.
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Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 39
·16617-16622
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IF 0
Dongdong Li,Liang-Xin Ding,Hongbin Chen,Suqing Wang,Zhong Li,Min Zhu,Haihui Wang
Carbonaceous materials with suitable structure and components are highly desirable for the development of lithium ion batteries (LIBs), since they can produce the best possible result by combining the advantages of the various structures and different components. To this end, herein, novel nitrogen-rich porous carbon spheres (N-PCS) with an appropriate pores distribution are proposed and prepared by using a template-assisted self-assembly method. The as-prepared N-PCS possess a high nitrogen content (>5%) and exhibit an interconnected sphere structure with large quantities of mesopores. As expected, the N-PCS display superior electrochemical performances, such as a high initial columbic efficiency (>60%), super cycle stability (retention of 540 mA h g−1 after 100 cycles at 0.5 A g−1), and good rate capability (215 mA h g−1 at 3 A g−1), thereby showing great promise as anode materials for the next generation of LIBs.
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MICROCHIMICA ACTA
·
2014
·Vol. 181
·期 9
·1059-1067
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IF 3.719
Zhang Zhihong,Liu Shunli,Kang Mengmeng,Yang Guang,Li Yanshan,Yan Fufeng,He Linghao,Feng Xiaozhong,Wang Peiyuan,Fang Shaoming
We report on a novel nanoarchitecture for use in highly bioactive electrochemical biosensors. It consists of multilayers of nanostructured plasma-polymerized pyrrole (ppPY) and nanosheets of electrically conductive graphene. The ppPY films were deposited by plasma-enhanced chemical vapor deposition on a graphene surface to form nanostructured composites (G-ppPY). The G-ppPY films were then coated with protein (BSA as a model) by adsorption, and then with DNA. The adsorption of protein and DNA on the nanocomposite was studied by electrochemical impedance spectroscopy and with a quartz crystal microbalance. Results demonstrated that the adsorption of biomolecules on G-ppPY films causes a higher variation in its electrochemical properties and adsorbed amount than that on a plain ppPY surface. This indicates that the presence of graphene can enhance the electrochemical activity of ppPY without reducing the sensitivity of biomolecular adsorption.
A novel nanoarchitecture is developed for use in highly bioactive electrochemical biosensors, which is composed of multilayers of nanostructured plasma-polymerized pyrrole and electrically conductive graphene nanosheets. The presence of graphene can enhance the electrochemical activity of ppPY without reducing the sensitivity of biomolecular adsorption.
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SENSORS AND ACTUATORS B-CHEMICAL
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2014
·
IF 3.84
Jianping Li,Weiling Yin,Yanji Tan,Hongcheng Pan
A novel strategy for improving the sensitivity of a molecularly imprinted sensor was proposed based on the amplification effect derived from the electrochemical stripping of copper produced by catalytic deposition by silver nanoparticles (AgNPs). Polypyrrole was electrochemically polymerized to prepare a molecularly imprinted polymer film using 3-indoleacetic acid (IAA) as a template. After the competitive reaction between IAA and thiolation-3-indoleacetic acid (IAA-S), IAA-S was labeled with AgNPs, and then copper was catalytically reduced and deposited onto the AgNP surface. The deposited copper was electrochemically dissolved, and the anodic stripping current was recorded using linear sweep voltammetry. The change in signal decreased when IAA-S was replaced by IAA in the samples. The peak current was proportional to the logarithm of the concentration of IAA in the range of 9 × 10 −10 –6 × 10 −7 mol/L, with a detection limit of 2.31 × 10 −10 mol/L determined by the 3 σ rule. Samples were assayed, and the recoveries of the approach ranged within 99.7–104.2%.
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