JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 24
·22284-22296
·
IF 2.22
Lv Xuehua,Lan Hai,Guo Jie,Guo Meixian,Yan Ya
AgInS 2 and Au-loaded AgInS 2 (denoted as Au/AgInS 2 ) were prepared by one-pot method with thioacetamide as sulfur source and mercaptoacetic acid as stabilizer. The structure, morphology, and optical properties of the obtained samples were characterized by XRD, XPS, BET, HRTEM, DLS, PL, and UV–vis-DRS. The photocatalytic activities of AgInS 2 and Au/AgInS 2 for the degradation of Rhodamine B (RhB) and 4-Nitrophenol (4-NP) under visible light irradiation were investigated, and the optimal proportions of Au introduced on AgInS 2 for the degradation of RhB and 4-NP were obtained. The possible degradation mechanisms of 4-NP by AgInS 2 and Au/AgInS 2 were proposed based on the active species trapping experiment, optical properties characterization, and the flat potential determination. The results showed that Au was successfully introduced on the surface of AgInS 2 nanoparticles, and the photocatalytic degradation efficiencies of Au/AgInS 2 toward RhB and 4-NP were higher than those of AgInS 2 . 5%Au/AgInS 2 was the optimal proportion for the degradation of RhB, and the degradation efficiency could reach 98% in 30 min, while 7.5%Au/AgInS 2 was the best proportion for the degradation of 4-NP, and the degradation efficiency could reach 100% in 30 min. The enhanced visible light photocatalytic performances of Au/AgInS 2 could be attributed to the stronger visible light absorption and the lower recombination probability of photogenerated electron–hole pairs. Active species trapping experiment suggested that the main active species was superoxide radical (·O 2 − ) for the degradation of RhB by Au/AgInS 2 , while for the degradation of 4-NP, the main active species were superoxide radical (·O 2 − ) and hydroxyl radical (·OH).
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Molecular Catalysis
·
2020
·
IF 3.687
Jiajun Dai,Yunlong Guo,Luhang Xu,Guilin Zhuang,Yi Zheng,Daohua Sun,Jiale Huang,Qingbiao Li
Bovine serum albumin (BSA)-templated CeO 2 was prepared by citrate sol-gel method and used as a support to synthesize Au catalyst for benzene oxidation. It was found that the Au/BSA-CeO 2 with 3.2 nm Au nanoparticles (NPs) gave rise to superior catalytic performance for benzene oxidation in which the temperature for 90 % benzene conversion was only 210 °C. In addition, the catalytic activity of Au/BSA-CeO 2 remained stable for 140 h of on-stream reaction. Besides, density functional theory calculation demonstrated how the porous structure of CeO 2 influenced the oxygen vacancy generation, and the synergetic effects of Au NPs and CeO 2 support facilitated the activation of benzene which was adsorbed on Au NPs prior to benzene oxidation. The catalysis of benzene oxidation over Au/CeO 2 catalyst follows the dual-site mechanism. BAS-templated CeO 2 support possessed hierarchical structure, abundant adsorbed oxygen species and synergic interaction with Au that determined the performance of Au/BSA-CeO 2 .
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 8
·1-10
·
IF 6.232
Zou Lina,Yang Lingxi,Zhan Yi,Huang Di,Ye Baoxian
A photoelectrochemical platform for thrombin determination was developed based on Au-rGO-CuS as multiple signal amplification elements. CuInS 2 QDs was used to sensitize burr-shape TiO 2 (b-TiO 2 ) to obtain a strong photocurrent. Under the specific recognition between aptamer and thrombin, a sandwichlike structure was formed and the Au-rGO-CuS-labeled aptamer (S2@Au-rGO-CuS) was immobilized on the electrode surface. This induced a sharp decrease in photocurrent. The phenomenon is mainly due to the fact that CuS NPs can competitively consume the light energy and electron donor with CuInS 2 /b-TiO 2 . The rGO can increase the amount of CuS NPs and the Au NPs can accelerate charge transferring which depress the recombination of photogenerated electrons and holes in CuS to further enhance the competitive capacity of CuS. The sandwichlike structure has a steric hindrance effect. Therefore, the S2@Au-rGO-CuS has a multiple signal amplification function for thrombin determination. Under optimal conditions, the PEC aptasensor exhibited a wide linear concentration range from 0.1 pM to 10 nM with a low detection limit of 30 fM (S/ N = 3) for thrombin. Besides, the designed aptasensor performed well in the assay of human serum sample, indicating good potential for the determination of thrombin in real samples.
Graphical abstract
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Shuang Dong,Zhou Yang,Baoliang Liu,Jintao Zhang,Peng Xu,Meng Xiang,Tong Lu
The research and develpoment of biomass waste derived carbon materials have attracted tremendous research interests in fabrication of high performance electrochemical sensors. In this work, noble metal NPs (i.e., Pd, Au and Ag) loading on Loofah sponge-derived well-ordered macroporous carbon (OMC)/ N -doped carbon thin layer (N-C) was designed by a general approach. This polydopamine (PDA)-based method has the advantages of simplicity, high efficiency and versatility. In virtue of the synergistic contribution from 3D macroporous carbon scaffold and highly active nobel metal NPs, these as-prepared Pd@OMC/N-C, Au@OMC/N-C and Ag@OMC/N-C electrode exhibit excellent electrochemical sensing performances for H 2 O 2 reduction, glucose oxidation and nitrite oxidation, respectively. Thus, 3D OMC/N-C loaded noble metal nanoparticles are promising materials for a wide spectrum of electrochemical sensor and biosensor applications.
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 32
·10472-10477
·
IF 7.393
Xia An,Chao Fan,Xiancheng Meng,Shuo Yuan,Yongkai Jing,Zhe Liu,Chun Sun,Yonghui Zhang,Zihui Zhang,Mengjun Wang,Hongxing Zheng,Erping Li
As an emerging two-dimensional material, tin disulfide (SnS2) has attracted growing interest due to its superior performance in high-speed and high-sensitive photodetectors. However, low responsivity, large dark current, and slow response speed severely hinder its further practical application. Herein, the enhanced photodetection performance of Schottky photodetectors based on SnS2 nanosheets and Schottky contact effects on the photodetection performance were investigated. High-quality SnS2 nanosheets were synthesized via a facile hydrothermal method. Then Schottky photodetectors with Pt/SnS2/Al and Au/SnS2/Al structures were fabricated and detected. Compared to the Ohmic Al/SnS2/Al photodetector, the Schottky Pt/SnS2/Al and Au/SnS2/Al photodetectors exhibited better photodetection performances, including tenfold higher responsivities, tenfold lower dark currents, and slightly shorter response times. In particular, the Schottky Pt/SnS2/Al photodetector obtained a low dark current of 5.2 nA, a high responsivity of 952 μA W−1, and a response time of 0.13 s. The enhancement in the photodetection performance of the Schottky photodetectors is due to the reverse bias and built-in electric field caused by Schottky contacts. Our finding provides an effective approach to enhance the photodetection performance of SnS2-based photodetectors for high-performance optoelectronic applications.
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SENSORS
·
2019
·Vol. 19
·期 5
·1203
·
IF 3.031
Nannan Shen,Haijun Xu,Weichen Zhao,Yongmei Zhao,Xin Zhang
Glucose concentration is an important physiological index, therefore methods for sensitive detection of glucose are important. In this study, Au foam was prepared by electrodeposition with a dynamic gas template on an Au nanoparticle/Si substrate. The Au foam showed ultrasensitivity, high selectivity, and long-term stability in the quantitative detection of glucose. The foam was used as an electrode, and the amperometric response indicated excellent catalytic activity in glucose oxidation, with a linear response across the concentration range 0.5 μM to 12 mM, and a limit of detection of 0.14 μM. High selectivity for interfering molecules at six times the normal level and long-term stability for 30 days were obtained. The results for electrochemical detection with Au foam of glucose in human serum were consistent with those obtained with a sensor based on surface-enhanced Raman spectroscopy and a commercial sensor. This proves that this method can be used with real samples. These results show that Au foam has great potential for use as a non-enzymatic glucose sensor.Keywords:Au foam;bubble-templated electrodeposition;non-enzymatic glucose sensor;amperometric response
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Lei Jin,Cheng Liu,Fang-Zu Yang,De-Yin Wu,Zhong-Qun Tian
Coordination behavior between theophylline (THP) molecule and Au(III) ion as well as electrochemical reduction of THP-Au(III) complexing ion were studied in detail. UV–vis absorption spectroscopy clarifies that Au(III) is coordinated with THP in a 1:2 M ratio. Raman spectroscopy indicates that it is N in THP chemically bonding to Au(III), and density functional theory (DFT) together with time-dependent density functional theory (TD-DFT) further reveal that the specific N atom is N9 in the imidazole ring (N7H form). Based on the invented formula of cyanide-free gold electroplating with THP as a complexant, the electrode behavior of THP-Au(III) ion on the gold electrode was studied. The results show that the stability constant K f of THP-Au(III) ion is 2.7 × 10 35 , and the reduction of THP-Au(III) ion is in irreversible with diffusion control.
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2019
·
IF 2.983
Yejing Jia,Bing Zhang,Honghong Chang,Feiyan Yu,Zhihuan Zhao
A simple colorimetric immunoassay based on visible light excitation for detection of carcinoembryonic antigen (CEA) was developed. Firstly, visible light photocatalysts of TiO 2 /SnO x -Au ternary heterostructures were prepared by in situ reduction method, which were characterized using transmission electron microscope (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray powder diffraction (XRD) and UV–vis diffuse reflectance spectroscopy (DRS). Then, a novel sandwich-type colorimetric immunoassay for quantitative analysis of CEA by using TiO 2 /SnO x -Au nanoparticle as signal tag was constructed. Under visible light irradiation (λ ≥ 420 nm), the color development of TMB was obtained. And the quantitative analysis was carried out in ABS buffer solution by ultraviolet spectrum scanning. Under optimal conditions, the absorbance values increased with the increasing of CEA levels in samples, which presented linear relationship in the range of 5 pg mL −1 –2.5 ng mL −1 with a detection limit of 5 pg mL -1 . Meanwhile, the colorimetric immunosensor owned acceptable specificity, stability and reproducibility.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 8
·B562
·
IF 3.12
Long Wu,Heng Yan,Jing Wang,Guojiao Liu,Weihong Xie
Based on tyrosinase modified Au-Pt@SiO2/Au-graphene (APS/Au-GN) electrode, a highly sensitive biosensor was developed for the direct electrochemical detection of bisphenol A (BPA) in food matrices. In this work, Au-graphene (Au-GN), Au-Pt@SiO2 nanocomposites (APS NPs) and tyrosinase (Tyr) were subsequently cast on glass carbon electrode (GCE) via the electrostatic interaction and Van der Waals force. The self-assembled APS NPs and Tyr were decorated on Au-GN forming a new hierarchical three dimensional nanostructure. Due to the dense Au/Pt dots distributed on silica nanoparticles, APS NPs could behave excellent catalytic activity and stability. In this regard, BPA could be sensitively detected by square wave voltammetry (SWV) and differential pulse voltammetry (DPV) with well-defined oxidation peaks at 480 mV and 660 mV, respectively. Under the optimal conditions, SWV detection behaved good analytical performance toward BPA with a wide linear response ranging from 0.01 mg L−1 to10 mg L−1. The detection limit of APS/Au-GN/GCE for BPA was 1.80 μg L−1 (S/N = 3). Moreover, the method showed good reproducibility in practical samples with recoveries from 87.4% to 110.7%, suggesting its potential application in food analysis and safety verification.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Chenyang Shi,Yao Xing,Aniruddha Patil,Zhaohui Meng,Rui Yu,Naibo Lin,Wu Qiu,Fan Hu,Xiang Yang Liu
In this work, we demonstrate the principle of mesoscopic construction of silk fibroin (SF) hybrid materials, which endows the materials with new performance. In implementing this strategy, mediating molecules, wool keratin (WK) molecules, were adopted to in-line synthesize Au nanoparticles (WK@AuNPs), which further create the stable linkage of AuNPs with SF nanofibril networks via templated β-crystallization. Fourier transform infrared spectroscopy, X-ray diffraction, and atomic force microscopy demonstrate that the mesoscopic hybrid network structure of the hybrid materials is different from neat SF materials, which gives rise to various new performances, that is, long-stable fluorescence emission. As the fluorescence emission can be characteristically annealed by Cu ions, therefore be adopted as the highly selective ion probes. Moreover, as WK@AuNPs are homogeneously connected to SF nanofibril networks, the carbonization of the materials leads to secondary hybrid materials of carbon–Au, where nano-sized Au particles are well distributed in carbonized mesoscopic conductive carbon networks. Such hybrid materials of carbon–Au can be further fabricated into electrochemical (i.e., dopamine) sensors, which are demonstrated to have excellent sensing performance.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Dong Li,Jie Lao,Chunli Jiang,Chunhua Luo,Ruijuan Qi,Hechun Lin,Rong Huang,Geoffrey I.N. Waterhouse,Hui Peng
Hydrogen production from water splitting through electrocatalytic or photoelectrochemical route shows great potential for renewable energy conversion. Herein, the plasmon-enhanced photoelectrical nanocatalysts (NCs) have been successfully developed by Au nanoparticle-decorated Bi 2 Se 3 nanoflowers (Au@Bi 2 Se 3 NFs) as catalysts for hydrogen evolution reaction (HER), leading to a more than 3-fold increase of current under excitation of Au localized surface plasmon resonance (LSPR) and affording a markedly decreased overpotential of 375 mV at a current density of 10 mA cm −2 . The HER enhancement can be largely attributed to effective electron-charge separation and the increase of carrier density in Bi 2 Se 3 induced by the injection of hot electrons of Au nanoparticles. Meanwhile, Bi 2 Se 3 nanoflowers (NFs), a kind of topological insulators, possess gapless edges on boundary and show metallic character on surface, providing a path for the flow of electrons in the electrocatalytic system . This study opens up a new avenue towards the design of higher energy conversion catalytic water splitting systems with the assistance of light energy , which could increase of HER catalysis efficiency by plasmonic excitation.
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Catalysts
·
2018
·Vol. 8
·期 4
·147
·
IF 3.465
Xiaoyu Chang,Junjiao Yang,Dandan Han,Bing Zhang,Xu Xiang,Jing He
Light-driven production of hydrogen peroxide (H2O2) is a green and sustainable way to achieve solar-to-chemical energy conversion. During such a conversion, both the high activity and the stability of catalysts were critical. We prepared an Au-supported C3N4catalyst—i.e., Au/C3N4-500(N2)—by strongly anchoring Au nanoparticles (~5 nm) onto a C3N4matrix—which simultaneously enhanced the activity towards the photosynthesis of H2O2and the stability when it was reused. The yield of H2O2reached 1320 μmol L−1on Au/C3N4-500(N2) after 4 h of light irradiation in an acidic solution (pH 3), which was higher than that (1067 μmol L−1) of the control sample Au/C3N4-500(Air) and 2.3 times higher than that of the pristine C3N4. Particularly, the catalyst Au/C3N4-500(N2) retained a much higher stability. The yield of H2O2had a marginal decrease on the spent catalyst—i.e., 98% yield was kept. In comparison, only 70% yield was obtained from the spent control catalyst. The robust anchoring of Au onto C3N4improved their interaction, which remarkably decreased the Au leaching when it was used and avoided the aggregation and aging of Au particles. Minimal Au leaching was detected on the spent catalyst. The kinetic analyses indicated that the highest formation rate of H2O2was achieved on the Au/C3N4-500(N2) catalyst. The decomposition tests and kinetic behaviors of H2O2were also carried out. These findings suggested that the formation rate of H2O2could be a determining factor for efficient production of H2O2.Keywords:hydrogen peroxide;Au catalyst;photosynthesis;carbon nitride
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