Journal article
Graphene-silver nanohybrids for ultrasensitive surface enhanced Raman spectroscopy: size dependence of silver nanoparticles
Journal of materials chemistry. C, Materials for optical and electronic devices, Vol.2(33), pp.6850-6858
01/01/2014
Abstract
The surface-enhanced Raman scattering (SERS) mechanism of graphene-silver (GE-Ag) nanohybrids was investigated by studying the Raman signals of rhodamine 6G (R6G) adsorbed onto nanohybrids with different sizes of Ag nanoparticles (NPs). The results showed that the SERS intensity ratios between GE-Ag NPs with Ag NPs with sizes of 9, 25 and 35 nm and pure Ag substrate were estimated to be 2.7, 5.0 and 8.9 respectively. GE sheets did improve the SERS activity due to their high adsorption ability, strong fluorescence quenching and additional chemical enhancement mechanism (CM)-based SERS effect. However, Ag NPs with relatively larger size (similar to nm) play a major role in SERS activity of molecules adsorbed on the nanohybrids. Furthermore, the free-standing GE-Ag NP nanohybrid film was fabricated through the vacuum filtration of the optimized GE-Ag NP composite suspension followed by thermal annealing. The as-prepared film has the larger size of Ag NPs and narrower interparticle distance, which provides more "hot spots" for sensitive detection of R6G molecules, with a detection limit at 1 x 10(-12) M. Additionally, the relative standard deviation (RSD) values are measured to be below 0.13, revealing a good consistency and reproducibility across the entire area of the film, suggesting this substrate holds a promise for routine SERS detection.
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Details
- Title
- Graphene-silver nanohybrids for ultrasensitive surface enhanced Raman spectroscopy: size dependence of silver nanoparticles
- Creators
- Yazhou Zhou - Washington State UniversityXiaonong Cheng - Jiangsu UniversityDan Du - Washington State UniversityJuan Yang - Jiangsu UniversityNan Zhao - Jiangsu UniversityShuangbiao Ma - Jiangsu UniversityTao Zhong - Jiangsu UniversityYuehe Lin - Washington State University
- Publication Details
- Journal of materials chemistry. C, Materials for optical and electronic devices, Vol.2(33), pp.6850-6858
- Academic Unit
- School of Mechanical and Materials Engineering
- Publisher
- Royal Soc Chemistry
- Number of pages
- 9
- Grant note
- 2009137 / Six Personnel Peak Project of Jiangsu Province CXZZ12_0670; CXZZ13_0664 / Scientific and Technical Innovation Project for Graduate Students 50902061 / National Science Foundation of China; National Natural Science Foundation of China (NSFC) WSU
- Identifiers
- 99901227643501842
- Language
- English
- Resource Type
- Journal article