Kinetically-Controlled Growth of Chestnut-Like Au Nanocrystals with High-Density Tips and Their High SERS Performances on Organochlorine Pesticides
| Autor: | Yue Li, Guangqiang Liu, Xia Zhou, Hongwen Zhang, Weiping Cai, Qian Zhao |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Nanostructure
Morphology (linguistics) Materials science SERS performances General Chemical Engineering High density 02 engineering and technology 010402 general chemistry 01 natural sciences Article lcsh:Chemistry symbols.namesake Molecule General Materials Science chlorinated pesticide residues kinetically-controlled seed growth Detection limit Substrate (chemistry) 021001 nanoscience & nanotechnology high-density tips 0104 chemical sciences lcsh:QD1-999 Chemical engineering Nanocrystal symbols 0210 nano-technology Raman scattering chestnut-like Au nanocrystals |
| Zdroj: | Nanomaterials Nanomaterials, Vol 8, Iss 7, p 560 (2018) Volume 8 Issue 7 |
| ISSN: | 2079-4991 |
| Popis: | A modified seed growth route was developed to fabricate the Au nanocrystals with high-density tips based on kinetically-controlled growth via adjusting the adding rate of Au seeds into growth solution. The obtained Au nanostructures were chestnut-like in morphology and about 100 nm in size. They were built of the radial [111]-oriented nanoneedles and were 30&ndash 50 nm in length. There were about 120&ndash 150 tips in each nanocrystal. The formation of chestnut-like Au nanocrystals is ascribed to surfactant-induced preferential growth of seeds along direction [111]. Importantly, the chestnut-like Au configuration displayed powerful surface enhanced Raman scattering (SERS) performance (enhance factor > 107), owing to the high density of tips. Further, such film was used as a SERS substrate for the detection of lindane (&gamma 666) molecules (the typical organochlorine pesticide). The detection limit was about 10 ppb, and the relationship between SERS intensity I and concentration C of 666 accords with the double logarithm linear. This work presents a simple approach to Au nanocrystal with high-density tips, and provides a highly efficacious SERS-substrate for quantitative and trace recognition of toxic chlorinated pesticides. |
| Databáze: | OpenAIRE |
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