Tsukruk, Vladimir V.

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Scholarly Materials And Research @ Georgia Tech

SERS-based DNT detection 	03/23/2007 Summary •Raman measurement of DNT powder OPreparation of gold nanoparticle assembly for SERS substrate 1. Use Au assembly inside the porous alumina membrane (large surface area) 2. Synthesis of CTAB-modified Au nanoparticles and assembly on silicon substrate • SERS measurement of DNT in ethanol • Surface coating of Au nanoparticles with different polyelectrolytes for receptor layer of DNT 3000 U) o• 2000 1000 0 5000 4000 1800 300 	600 	900 	1200 	1500 600 	900 	1200 	1500 1800 Raman shift (cm -1 ) Intensity at -1350 cm -1 Bare Au 73 PDDA 193 PAH 158 PEI 108 PAA 93 PSS 66 2500 • Polyelectrolytes with amine groups are best for DNT detection • PDDA > PAH > PEI SERS of DNT on au infiltrated alumina membrane Bare Au PAA PAH PDDA PEI PSS Raman shift (cm -1 ) Raman spectra of DNT powder showed typical NO2 out-of-plane bending modes at 836 cm -1 and the NO2 stretching modes at 1348 cm -1 SERS measurement of DNT on PDDA coated Au inside the alumina membrane 3500 3000- 1% 1000 ppm 100 ppm - 10 ppm 2500- (n +6. 2000- z 0 1500- 1000 500 1 300 	600 	900 	1200 * 1500 Raman shift (cm -1 ) 1800 3500 	 3000 - 2500 - N 2000 - c 1500 - 1000 - 500 - 0 - 300 	600 	900 	1200 	1500 1800 - Sample 1 - Sample 2 - Sample 3 - Sample 4 I Highly-packed Au assembly One-dimensional chain-like aggregate of Au Raman shift (cm -1 ) Samples Intensity at —1350 cm -1 Chain-like assembly (sample 1) 49 Highly-packed assembly (sample 2) 817 PDDA coating on chain-like assembly (sample 3) 254 PDDA coating on highly- packed assembly (sample 4) 2212 

SERS-based DNT detection

https://smartech.gatech.edu/bitstream/1853/34474/1/104386_10090.pdf

SERS-based DNT detection

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Scholarly Materials And Research @ Georgia Tech