Journal
NANOMATERIALS
Volume 8, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/nano8070560
Keywords
kinetically-controlled seed growth; chestnut-like Au nanocrystals; high-density tips; SERS performances; chlorinated pesticide residues
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Funding
- National Key Research and Development Program of China: Fundamental Research on nanosensing materials and high-performance sensors focused on pollutants detection [2017YEA0207101]
- Natural Science Foundation of China [51531006, 11574313, 51571188]
- CAS/SAF International Partnership Program for Creative Research Teams
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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 30-50 nm in length. There were about 120-150 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 > 10(7)), 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.
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