Xiaoye Hu
Chinese Academy of Sciences
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Publication
Featured researches published by Xiaoye Hu.
Nano Research | 2015
Chuhong Zhu; Guowen Meng; Qing Huang; Xiujuan Wang; Yiwu Qian; Xiaoye Hu; Haibin Tang; Nianqiang Wu
This paper describes a ZnO-nanotaper array sacrificial templated synthetic approach for the fabrication of the arrays of nanotubes with tube-walls assembled by building-blocks of Ag-nanoplates, Au-nanorods, Pt-nanothorns or Pd-nanopyramids, thus possessing high-density 3D “hot spots” in sub-10-nm gaps of neighboring building blocks with nano-tips, -corners or -edges. Additionally, these hierarchical nanostructure arrays possess high surface area with rich surface chemistry, being beneficial to capturing the analyte. The Ag-nanoplateassembled nanotube arrays can be used as sensitive surface-enhanced Raman scattering (SERS) substrates with good signal uniformity and reproducibility. Using such Ag hierarchical nanostructure arrays as SERS-substrates, not only has 10−14 M rhodamine 6G been identified, but also 10−7 M polychlorinated biphenyls (PCBs, a notorious class of persistent organic pollutants) are recognized, and even two congeners of PCBs can be identified in a mixture, showing the potential applications of the materials in SERS-based rapid detection of environmental organic pollutants.
Nano Research | 2014
Zhulin Huang; Guowen Meng; Qing Huang; Bin Chen; Fei Zhou; Xiaoye Hu; Yiwu Qian; Haibin Tang; Fangming Han; Zhaoqin Chu
AbstractSurface-enhanced Raman spectroscopy (SERS) is a fast analytical technique for trace chemicals; however, it requires the active SERS-substrates to adsorb analytes, thus limiting target species to those with the desired affinity for substrates. Here we present networked polyacrylic acid sodium salt (PAAS) film entrapped Ag-nanocubes (denoted as Ag-nanocubes@PAAS) as an effective SERS-substrate for analytes with and without high affinity. Once the analyte aqueous solution is cast on the dry Ag-nanocubes@PAAS substrate, the bibulous PAAS becomes swollen forcing the Ag-nanocubes loose, while the analytes diffuse in the interstices among the Ag-nanocubes. When dried, the PAAS shrinks and pulls the Ag-nanocubes back to their previous aggregated state, while the PAAS network “detains” the analytes in the small gaps between the Ag-nanocubes for SERS detection. The strategy has been proven effective for not only singleanalytes but also multi-analytes without strong affinity for Ag, showing its potential in SERS-based simultaneous multi-analyte detection of both adsorbable and non-adsorbable pollutants in the environment.
Journal of Materials Chemistry C | 2013
Kexi Sun; Guowen Meng; Qing Huang; Xianglong Zhao; Chuhong Zhu; Zhulin Huang; Yiwu Qian; Xiujuan Wang; Xiaoye Hu
Large area arrays of length-tunable alumina nanotips on the joints of hexagonally patterned conical-pores in an anodic aluminum oxide (AAO) template are achieved via a repeated process of anodizing Al foil for pore growth downwards and phosphoric acid etching for pore-widening. By top-view sputtering Ag on the alumina nanotip arrays, hexagonally patterned arrays of Ag-nanorods (Ag-NRs) on the alumina nanotips and uniformly distributed Ag-nanoparticles (Ag-NPs) on the upper rim of the inner surface of the conical-pores are obtained and they exhibit strong surface-enhanced Raman scattering (SERS) activity due to the high density of sub-10 nm gaps between the nearest neighboring Ag-NRs and between the adjacent Ag-NPs. The resultant nanostructures are tailored to attain an optimal SERS enhancement factor of ∼3.2 × 107 by tuning the Ag-sputtering duration. SERS measurements demonstrate that the as-fabricated large-scale Ag-nanostructures can serve as highly sensitive and reproducible SERS substrates. Finite element method calculation also confirms that the fabricated substrates possess excellent SERS activity. By modifying the Ag-NR arrays with mono-6-thio-β-cyclodextrin, the SERS detection limit of PCB-77 (a congener of polychlorinated biphenyls (PCBs)) reaches 10−6 M, showing potential in SERS-based rapid detection of trace PCBs, a kind of global environmental hazardous material.
ACS Applied Materials & Interfaces | 2014
Xiaoye Hu; Guowen Meng; Qing Huang; Chuhong Zhu; Bensong Chen; Zhulin Huang; Fadi Li; Zhaoming Wang
Nano-petri-dish array assisted glancing angle Ag-sputtering was reported to synthesize Ag-nanoparticle (Ag-NP) assembled bi-nanoring arrays as surface-enhanced Raman scattering (SERS) substrates. By manipulating the sputtering-Ag duration, the gaps between the Ag-NPs in the bi-nanorings are tunable to acquire optimal electromagnetic field enhancement, and the ordered bi-nanoring arrays ensure excellent reproducibility for Raman measurement. Such as-fabricated Ag-NPs assembled nanoring arrays exhibit excellent SERS performance, not only 1 × 10(-12) M rhodamine 6G has been identified, but also polychlorinated biphenyls with a low concentration down to 1 × 10(-9) M has been recognized, showing great potential in the detection of trace organic pollutants in the environment.
Science Advances | 2015
Fangming Han; Guowen Meng; Fei Zhou; Li Song; Xinhua Li; Xiaoye Hu; Xiaoguang Zhu; Bing Wu; Bingqing Wei
Three-dimensional nanoarchitectural design of electrodes to simultaneously boost capacitance and breakdown voltage of dielectric capacitors. Dielectric capacitors are promising candidates for high-performance energy storage systems due to their high power density and increasing energy density. However, the traditional approach strategies to enhance the performance of dielectric capacitors cannot simultaneously achieve large capacitance and high breakdown voltage. We demonstrate that such limitations can be overcome by using a completely new three-dimensional (3D) nanoarchitectural electrode design. First, we fabricate a unique nanoporous anodic aluminum oxide (AAO) membrane with two sets of interdigitated and isolated straight nanopores opening toward opposite planar surfaces. By depositing carbon nanotubes in both sets of pores inside the AAO membrane, the new dielectric capacitor with 3D nanoscale interdigital electrodes is simply realized. In our new capacitors, the large specific surface area of AAO can provide large capacitance, whereas uniform pore walls and hemispheric barrier layers can enhance breakdown voltage. As a result, a high energy density of 2 Wh/kg, which is close to the value of a supercapacitor, can be achieved, showing promising potential in high-density electrical energy storage for various applications.
Nanotechnology | 2016
Xiaoye Hu; Peng Zheng; Guowen Meng; Qing Huang; Chuhong Zhu; Fangming Han; Zhulin Huang; Zhongbo Li; Zhaoming Wang; Nianqiang Wu
An ordered array of hierarchically-structured core-nanosphere@space-layer@shell-nanoparticles has been fabricated for surface-enhanced Raman scattering (SERS) detection. To fabricate this hierarchically-structured chip, a long-range ordered array of Au/Ag-nanospheres is first patterned in the nano-bowls on the planar surface of ordered nanoporous anodic titanium oxide template. A ultra-thin alumina middle space-layer is then conformally coated on the Au/Ag-nanospheres, and Ag-nanoparticles are finally deposited on the surface of the alumina space-layer to form an ordered array of Au/Ag-nanosphere@Al2O3-layer@Ag-nanoparticles. Finite-difference time-domain simulation shows that SERS hot spots are created between the neighboring Ag-nanoparticles. The ordered array of hierarchical nanostructures is used as the SERS-substrate for a trial detection of methyl parathion (a pesticide) in water and a limit of detection of 1 nM is reached, indicating its promising potential in rapid monitoring of organic pollutants in aquatic environment.
RSC Advances | 2016
Xiujuan Wang; Chuhong Zhu; Zhulin Huang; Xiaoye Hu; Xiaoguang Zhu
In this paper, we proposed a simple in situ method for the synthesis of pristine-graphene/Ag nanocomposites by chemical reduction of Ag ions in a N-methyl pyrrolidone solution in which pristine-graphene had been homogeneously dispersed. Ag nanoparticles can be directly attached on the pristine-graphene surface without any functionality. The obtained pristine-graphene/Ag nanocomposites are investigated by transmission electron microscopy, X-ray diffraction, and X-ray photoemission spectroscopy. The results show that Ag nanoparticles are homogeneously distributed on the pristine-graphene sheets with high density. We further demonstrate that this pristine-graphene/Ag nanocomposites exhibit a very strong surface-enhanced Raman scattering (SERS) effect, which can be used as ultrasensitive SERS substrates for chemical and biological analysis.
Advanced Materials | 2016
Chuhong Zhu; Guowen Meng; Peng Zheng; Qing Huang; Zhongbo Li; Xiaoye Hu; Xiujuan Wang; Zhulin Huang; Fadi Li; Nianqiang Wu
Applied Surface Science | 2016
Yun-Chang Yao; Xin-Rong Dai; Xiaoye Hu; Su-Zhen Huang; Zhen Jin
Nanotechnology | 2012
Xiaoye Hu; Guowen Meng; Qing Huang; Wei Xu; Fangming Han; Kexi Sun; Qiaoling Xu; Zhaoming Wang