SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Peng Wang,Tao Dong,Changchao Jia,Ping Yang
ZnO flowers with thin sheet and hemisphere shapes were fabricated via thermal decomposition in an organic solvent. Especially, typical hemisphere morphology with exposed (002) crystal face were created for the first time. Because of exposed (002) facet increased, a facet-like heterostructure of ZnO formed to get enhanced sensor performance, especially after loading Au nanoparticles (NPs) using a supersonic chemistry way. Gas sensing tests indicate that the hemisphere Au/ZnO sensor with the best performance and a nice selectivity to acetone. This is ascribed that the unique second-level structure provides more active centers and diffusion channels for acetone molecules. Au NPs increases the thickness of the surface electron depletion layer, which enhanced the sensitivity of the gas sensor.
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Catalysts
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2019
·Vol. 9
·期 8
·653
·
IF 3.444
Huaiyin Chen,Huaijin Chen,Ruoyu Hong
Herein, MoS2nanoslices were simply prepared by using ultrasonic treatment, and were further decorated with Au nanoparticles (AuNPs) through an electrodeposition process to obtain the MoS2/Au nanocomposites. The obtained nanocomposites display synergetic electrocatalytic effect for the oxidation of dopamine due to the large surface area and two-dimensional structure of the MoS2nanoslices, combining with the high catalytic activity and good conductivity of AuNPs. An electrochemical sensor was constructed based on MoS2/Au-modified carbon paste electrode, for sensitive and quantitative determination of dopamine. The prepared electrochemical sensor proves excellent analytical performances: very high sensitivity, wide linear ranges (0.5–300 μM), and low detection limit (76 nM). Moreover, the dopamine sensor also displays high selectivity, good reproducibility and stability, and can be used in real sample analysis. The method of fabricating high-efficiency electrocatalysts and electrochemical sensors proposed in this study provides a good reference for developing more functionalized nanocomposites and for extending practical applications.Keywords:dopamine;MoS2;AuNPs;electrocatalyst;sensor
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Shuang Lin,Xiang Lin,Siqingaowa Han,Liang He,Haiyan Zhao,Jing Zhang,Wuliji Hasi,Li Wang
An efficient and facile strategy for producing core-shell Au@Ag nanorods (NRs) with controllable width and length as excellent surface enhanced Raman scattering (SERS) substrate was proposed. Au nanodipyramids (NDPs) of three various widths were prepared by overgrowth along the radial orientation, and together with Au NDPs as seed, silver was deposited in the axial orientation to successfully obtain core-shell Au@Ag NRs with diverse length (73 nm–157 nm) and width (25 nm–43 nm). The morphology, optical properties and SERS performance of the as-synthesized Au@Ag NRs were investigated systematically. The broadly tunable UV-Vis absorption range for Au@Ag NRs as far as the near-infrared (NR) region was able to be obtained. Furthermore, the SERS property of Au@Ag NRs two-dimensional monolayer was explored by using crystal violet (CV) as Raman probe. The optimal SERS enhancement effect with enhancement factor (EF) as high as 6.13✕10 5 could be achieved for Au@Ag NRs with wider width and longer length, which was confirmed by the simulation results of electromagnetic (EM) field distribution by FDTD method. Our novel approach provides some facinating insights into adjusting the width of Au@Ag NRs, which also significantly influences the SERS behaviors of the Au@Ag NRs. It allows to fabricating SERS substrate with superior SERS performance compared to previously reported Au@Ag NRs only with tunable length via direct overgrowth. Besides, this as-compounded Au@Ag NRs are expected to have promising application and significant value in other fields.
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CHINESE JOURNAL OF CATALYSIS
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2018
·
IF 3.525
Shengyang Wang,Bin Zeng,Can Li
Plasmonic photocatalysis with tunable light absorption has aroused significant attention in solar-to-chemical energy conversion. However, the energy conversion efficiency of plasmonic photocatalysts is impeded by ineffective charge separation and the lack of highly active sites for redox reactions. In this work, the Au nanoparticle size and Au-TiO 2 interaction of the Au/TiO 2 plasmonic photocatalyst were adjusted simultaneously using a post-calcination treatment. The visible-light-induced water oxidation activity exhibited a volcano-like relationship with the calcination temperature; the treated photocatalyst at 600 °C manifested the highest activity. Characterization with UV-visible spectra, XRD, SEM, and XPS revealed that the effect of the Au nanoparticle size and Au-TiO 2 interaction were both responsible for the increase in plasmon-induced water oxidation activity.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Kui Yin,Shanshan Zhang,Yuyang Sun,Hui Huang,Yafei Cheng,Fan Liao,Mingwang Shao
Hydrogen is considered as a promising energy source because of its high combustion heat and clean products. Among the various hydrogen evolution methods, electrocatalysis is the most convenient and effective way. However it is still problematic to find low-cost and high-efficiency electrocatalysts. In this work, Os-Ag-Si and Os-Au-Si ternary electrocatalysts were investigated. It is interesting that Os-Ag-Si exhibits higher hydrogen evolution performance than that of Os-Au-Si, even though Ag is a worse HER catalyst than Au. The optimal ternary catalyst Os-Ag-Si with mass ratio of 15:15:70 (Os:Ag:Si) was synthesized by a facile Si H bond reduction method, which shows superior hydrogen evolution reaction performance with a low Tafel slope of 40 mV·dec −1 . In addition, the current density of Os-Ag-Si-15 catalyst surpasses that of 20% Pt/C when the overpotential is larger than 160 mV. The introduction of Ag in the Os-Ag-Si ternary catalyst could enhance the electrocatalytic activity, reduce the cost of catalysts, and even be better than Os-Au-Si.
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Nano Energy
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2018
·
IF 13.12
Xinyuan Li,Muhammad Ahsan Iqbal,Meng Xu,Yi-Chi Wang,Hongzhi Wang,Muwei Ji,Xiaodong Wan,Thomas J.A. Slater,Jia Liu,Jiajia Liu,Hongpan Rong,Wenxing Chen,Stephen V. Kershaw,Sarah J. Haigh,Andrey L. Rogach,Liming Xie,Jiatao Zhang
We have explored the synthesis of Au@Hg x Cd 1-x Te core@shell nanorods by sequential aqueous cation exchange (ACE) for near-infrared photodetector application. A number of related Au@telluride core/shell nanorod structures were put forwarded, taking advantage of multi-step transformations through a binary and then a ternary phase for the telluride shells. The latter have a high degree of crystallinity thanks to the step-wise ACE method. The use of only trace amounts of Cd 2+ coordinated with tri- n -butylphosphine, assisted the phase transformation from an amorphous Ag 2 Te shell to a highly crystalline Ag 3 AuTe 2 shell in the first stage; this was followed by a further cation exchange (CE) step with far higher Cd 2+ levels to fabricate a highly crystalline CdTe shell, and with an additional CE with Hg 2+ to convert it to a Hg x Cd 1-x Te shell. The composition of the shell components and the well-controlled thickness of the shells enabled tunable surface plasmon resonance properties of the Au@telluride nanorods in the NIR region . Utilizing the enhanced NIR absorption , a hybrid photodetector structure of Au@Hg x Cd 1-x Te nanorods on graphene was fabricated, showing visible to NIR (vis-NIR) broadband detection with high photoresponsivity (~10 6 A/W).
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ELECTROCHIMICA ACTA
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2018
·
IF 5.116
Fangming Lou,Anjun Wang,Jing Jin,Qunfang Li,Shenghui Zhang
We report here one-pot green synthetic method for preparing popcorn-like Au@Polyluminol nanoflowers by using the HAuCl 4 to directly oxidize luminol at a specific controlled mass ratio of HAuCl 4 : luminol in hydrothermal conditions for the first time. The Au@Polyluminol nanoflowers were attached to the surface of a GCE electrode to form a highly solid-state electrochemiluminescent (ECL) sensor, which exhibited strong and stable ECL intensity, showed excellent ECL behavior. Further, the as-prepared Au@Polyluminol nanoflowers could also be used for the immobilization of uricase on an electrode surface to fabricate a sensitive solid-state Uric Acid ECL biosensor, which indicate that the Au@Polyluminol nanoflowers is a promising candidate for constructing various sensitive solid-state ECL sensors and promoting the application in electroanalytical and biochemical analysis.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yuan Li,Yusheng Zhou,Yong Wang,Ru Zhou,Qiang Ling,Haihong Niu,Wei Zhang,Chaoqun Wang,Jihong Qiu,Zhiqiang Guo,Jinzhang Xu
Urchin-like TiO 2 hierarchical microspheres (UTHMs) with an extremely large surface area of 331 m 2 g −1 were synthesized via a facile one-pot hydrothermal method and studied for dye-sensitized solar cells (DSSCs) application. In-situ growth of Au nanoparticles (NPs) on the surface of the UTHMs were further conducted to achieve Au-decorated UTHMs (Au-UTHMs). A series of novel composite photoanode films were designed through the combined use of Au-UTHMs and UTHMs at different mass ratios. The DSSC constructed with the composite photoanode prepared under an optimal Au-UTHMs to UTHMs ratio of 2 wt% yields a considerable power conversion efficiency of 7.21%, which was markedly higher than that of the pure P25 NPs based device (5.19%) and pure UTHMs based device (6.10%). The significantly enhanced performance of the composite photoanode based DSSC can be attributed to the synergistic effect of two benefits: (1) the large specific surface area, strong light scattering and fast electron transfer channels arising from the novel hierarchical features of UTHMs, and (2) the enhanced light absorption owing to the localized surface plasmon resonance (LSPR) effect of Au NPs.
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ANALYTICAL CHEMISTRY
·
2018
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IF 6.042
Yuxiu Zou,Yinling Zhang,Yiting Xu,Yiqin Chen,Siqi Huang,Yifan Lyu,Huigao Duan,Zhuo Chen,Weihong Tan
Point-of-care testing (POCT) devices represent a growing field that aims to develop low-cost, rapid, sensitive diagnostic testing platforms that are portable and self-contained. Surface-enhanced Raman spectroscopy (SERS) is an approach has shown high potential in POCT technology. However, the specificity or ability to uniquely detect a desired biomarker in complex biological samples is a key factor for translating SERS technologies to POCT. Herein, we fabricated cellulose SERS strips (CS) decorated with novel plasmonic nanoparticles, termed graphene-isolated-Au-nanocrystals (GIANs), for the portable detection of complex biological samples. This CS@GIANs SERS strip was used to detect free bilirubin (BR) in the blood of newborns, a biomarker of jaundice, without sample labeling or prepreparation. CS@GIANs showed superior affinity to hydrophobic BR molecules compared to typical SERS substrate, which reduced the steric hindrance effect from the nonspecific binding of BR with serum albumin in blood and improved sensitivity. Meanwhile, with the separation property of cellulose chromatography papers, CS@GIANs showed superior anti-interference to other biomolecules that had been previously adsorbed on the SERS strip. Moreover, the SERS signal from the graphitic shell of GIANs could be used as a stable internal calibration standard, which improved the reproducibility and accuracy of Raman analysis. Such a cellulose SERS strip holds high potential for enhancing current efforts in the development of rapid and low-cost point-of-care diagnostic testing.
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高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 10
·6041-6053
·
IF 3.809
Yu Qian,Kong Xianming,Ma Yibo,Wang Rui,Liu Qing,Hinestroza Juan P.,Wang Alan X.,Vuorinen Tapani
Abstract Multi-functional cellulose fiber-Au composites were fabricated through a simple and cost-effective procedure by decorating regenerated cellulose fibers with Au nanoparticles. The cellulose fibers were regenerated from waste paper through the Ioncell-F process, an environmental friendly approach. After grafting positive charge, the surface of the cellulose fibers were decorated with citrate-stabilized plasmonic Au nanoparticles (NPs). X-ray photoelectron spectroscopy, scanning electron microscopy, X-ray diffraction, and optical images were used to characterize the regenerated cellulose fibers and fiber-Au NP composites. The fiber-Au composites exhibited different colors as the localized surface plasmon resonance property of Au NPs, which enables visual sensing of the water content in the fiber-Au composites through a colorimetric method. Furthermore, the regenerated cellulose fiber-Au composite was used as an enhanced substrate for the sensing of malachite green via surface-enhanced Raman scattering, in which the limit of detection was lower than 10 ppb. The multi-functional cellulose fibers are potentially suitable for the detection of toxins and the monitoring of water quality. Graphical abstract
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Plasmonics
·
2013
·Vol. 8
·期 2
·1193-1202
·
IF 2.425
Han Zhizhong,Wei Liyuan,Zhang Zhankun,Zhang Xinqi,Pan Haibo,Chen Jianzhong
The semiconductor metal oxide, ZnO, is limited to application in photocatalysis because of large bandgap. Metallic nanostructures are utilized to enhance visible-light absorption and improve photocatalytic activity via surface plasmon resonance (SPR). In this work, through a facile thermal decomposition method, the Au nanoparticles (NPs) were successfully loaded on oriented hierarchical ZnO flower-rod (ZFRs) heterostructures, which have a higher areal proportion of exposed active (001) crystal faces. The results indicate that ZFRs are wurtzite phase grown along the [001] direction and the Au NPs spread on the surface of ZFRs in metallic form. It reveals that there is an electronic interaction between Au NPs and ZFRs, and more oxygen molecules are adsorbed on the surface of Au-ZnO flower-rod heterostructures (AZFRs). The AZFRs show a strong absorbance in visible region due to the SPR and enhance the separation of electron–hole pair, resulting in an improvement of photocatalytic activity under visible-light irradiation. During 80 min, the degradation efficiency of rhodamine B for AZFRs-20 is about 3.7 times as the pure ZFRs. Moreover, the AZFRs exhibit predominant photoelectrochemical properties, and the photocurrent can reach 1.2 × 10 −4 A. Finally, the as-prepared photocatalytic device composed of AZFRs based on indium doped tin oxide glass is convenient to recycle without centrifugation.
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Nanoscale
·
2013
·Vol. 5
·期 12
·5628-5636
·
IF 6.233
Wei Wu,Lei Liao,Shaofeng Zhang,Juan Zhou,Xiangheng Xiao,Feng Ren,Lingling Sun,Zhigao Dai,Changzhong Jiang
We present an innovative approach to the production of sub-100 nm hollow Au–SnO2 hybrid nanospheres, employing a low-cost, surfactant-free and environmentally friendly solution-based route. The hollow hybrid nanostructures were synthesized using a seed-mediated hydrothermal method, which can be divided into two stages: (1) formation of multicore–shell Au@SnO2 nanoparticles (NPs) and (2) thermal diffusion and ripening to form hollow Au–SnO2 hybrid NPs. The morphology, optical properties and formation mechanism were determined by a collection of joint techniques. Photocatalytic degradation of Rhodamine B (RhB) in the liquid phase served as a probe reaction to evaluate the activity of the as-prepared hollow hybrid Au–SnO2 NPs under the irradiation of both visible light and ultraviolet light. Significantly, the as-obtained Au–SnO2 hybrid nanostructures exhibited enhanced visible light or UV photocatalytic abilities, remarkably superior to commercial pure SnO2 products and P25 TiO2, mainly owing to the effective electron hole separation at the SnO2–Au interfaces and strong localization of plasmonic near-fields effects.
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