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Title:
Dealloying Ag-Al Alloy to Prepare Nanoporous Silver as a Substrate for Surface-Enhanced Raman Scattering: Effects of Structural Evolution and Surface Modification
Author: Qiu, Huajun1,2; Zhang, Zhonghua3; Huang, Xirong1; Qu, Yinbo4
Source: CHEMPHYSCHEM
Issued Date: 2011-08-01
Volume: 12, Issue:11, Pages:2118-2123
Keyword: nanoparticles ; Raman spectroscopy ; silver ; size effects ; structural evolution
DOI: 10.1002/cphc.201100205
DOC Type: Article
English Abstract: Sensitive detection of molecules by using the surface-enhanced Raman scattering (SERS) technique depends on the nanostructured metallic substrate and many efforts have been devoted to the preparation of SERS substrates with high sensitivity, stability, and reproducibility. Herein, we report on the fabrication of stable monolithic nanoporous silver (NPS) by chemical dealloying of Ag-Al precursor alloys with an emphasis on the effect of structural evolution on SERS signals. It was found that the dealloying conditions had great influence on the morphology (the ligament/pore size) and the crystallization status, which determined the SERS signal of rhodamine 6G on the NPS. NPS with small pores, low residual Al, and perfect crystallization gave high SERS signals. A high enhancement factor of 7.5 x 10(5) was observed on bare NPS obtained by dealloying Ag(30)Al(70) in 2.5 wt% HCl at room temperature followed by 15 min aging at around 85 degrees C. After coating Ag nanoparticles on the NPS surface, the enhancement factor increased to 1.6 x 10(8) owing to strong near-field coupling between the ligaments and nanoparticles.
WOS Headings: Science & Technology ; Physical Sciences
WOS Subject: Chemistry, Physical ; Physics, Atomic, Molecular & Chemical
WOS Subject Extended: Chemistry ; Physics
WOS Keyword Plus: GOLD NANOPARTICLE ARRAYS ; SPECTROSCOPY ; FILMS ; AU ; NANOSTRUCTURES ; COPPER ; SIZE ; MICROSTRUCTURE ; FABRICATION ; DEPOSITION
Indexed Type: SCI
Language: 英语
WOS ID: WOS:000293385400011
Citation statistics:
Content Type: 期刊论文
URI: http://ir.qibebt.ac.cn/handle/337004/6749
Appears in Collections:生物传感技术团队_期刊论文

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description.institution: 1.Shandong Univ, Minist Educ China, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China
2.Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, Qingdao 266101, Peoples R China
3.Shandong Univ, Key Lab Liquid Struct & Hered Mat, Jinan 250100, Peoples R China
4.Shandong Univ, State Key Lab Microbial Technol China, Jinan 250100, Peoples R China

Recommended Citation:
Qiu, Huajun,Zhang, Zhonghua,Huang, Xirong,et al. Dealloying Ag-Al Alloy to Prepare Nanoporous Silver as a Substrate for Surface-Enhanced Raman Scattering: Effects of Structural Evolution and Surface Modification[J]. CHEMPHYSCHEM,2011,12(11):2118-2123.
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