Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 23, Pages 21335-21345Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am506297n
Keywords
chitosan; silver; meso-flowers; SERS; thiophenol
Funding
- National Research Foundation of Korea (NRF) grant - Korea government (MEST) [20090093908]
- National Research Foundation of Korea Grant - Korean Government (MEST) [NRF-2010-C1AAA001-2010-0028958]
- National Research Foundation of Korea [2012M1A2A2671792] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Highly asymmetrical flower-like micron silver particles, so-called hierarchical silver meso-flowers (AgMFs), were facilely synthesized using ascorbic acid at room temperature in the presence of chitosan biopolymer. The time-evolution of TEM images and XRD analysis confirmed the anisotropic growth of AgMFs with single crystalline phase of which the formation mechanism was described in detail. The morphology and size of as-prepared AgMFs were tunable simply by changing the concentration of chitosan biopolymer and/or AgNO3 precursor under otherwise identical conditions. The asymmetrically textured AgMFs dramatically enhanced Raman signals of probe molecules (2-chlorothiophenol, 4-aminothiophenol) even at a single particle level because of their surface morphologies consisting of numerous nanoedges and crevices.
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