In situ and room-temperature synthesis of ultra-long Ag nanoparticles-decorated Ag molybdate nanowires as high-sensitivity SERS substrates

Zhi Yong Bao, Dangyuan Lei, Jiyan Dai, Yucheng Wua

Research output: Journal article publicationJournal articleAcademic researchpeer-review

26 Citations (Scopus)

Abstract

We report on room-temperature synthesis of Ag nanoparticles (NPs) decorated silver molybdate nanowires (SMNs) using a solution-based chemical reaction method. We show that AgxMoyOz(Ag2Mo2O7, Ag2MoO4and Ag6Mo10O33) nanomaterials can be selectively synthesized by altering the pH value of the reaction media in the presence of silicotungstic acid at room temperature. This reaction process uses isopropyl alcohol as a free radical scavenger and occurs over a short reaction time compared to the traditional hydrothermal method. Moreover, we demonstrate that under UV-light illumination of different periods, Ag NPs of controllable distribution densities are formed in situ on the surface of SMNs in tungstosilicate acid environment. We show that the SERS sensitivity of such Ag NP-SMN complex depends on the distribution density of Ag NPs, with the best structure capable of detecting the p-aminothiophenol at a concentration as low as 1.0 × 10-11M. The same substrate is further used to enhance the Raman signal from 2-mercaptopyridine from which a quantitative relationship between the analyte concentration and its corresponding Raman intensity can be established.
Original languageEnglish
Pages (from-to)404-410
Number of pages7
JournalApplied Surface Science
Volume287
DOIs
Publication statusPublished - 1 Jan 2013

Keywords

  • Molybdate nanowires
  • Raman spectroscopy
  • Room-temperature synthesis
  • Silver metal nanoparticles

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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