DNA-network-templated self-assembly of silver nanoparticles and their application in surface-enhanced Raman scattering.
A large-scale lambda-DNA network on a mica surface was successfully fabricated with a simple method. Silver nanoparticles capped with the cationic surfactant cetyltrimethylammonium bromide (CTAB) were self-assembled onto a two-dimensional DNA network template by electrostatic interaction and formed nanoporous silver films, which can be used as active surface-enhanced raman scattering (SERS) substrates. Two probe molecules, Rhodamine 6G (R6G) and 4-aminothiophenol (4-ATP), were studied on these substrates with very low concentrations, and great enhancement factors for R6G (0.21 x 10(10)-4.09 x 10(11)) and 4-ATP (approximately 1.70 x 10(5)) were observed. It was found that the enhancement ability was affected by the DNA concentration and the electrostatic absorption time of the CTAB-stabilized silver nanoparticles on the DNA strands. These SERS substrates formed by the self-assembly of silver nanoparticles on DNA network also show good stability and reproducibility in our experiments.
Wei
Gang
G
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun 130022 China.
Wang
Li
L
Liu
Zhiguo
Z
Song
Yonghai
Y
Sun
Lanlan
L
Yang
Tao
T
Li
Zhuang
Z
D000814:Aniline Compounds / Q000737:chemistry; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D004247:DNA / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D012235:Rhodamines / Q000737:chemistry; D012542:Scattering, Radiation; D012680:Sensitivity and Specificity; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013438:Sulfhydryl Compounds; D013499:Surface Properties
D000814:Aniline Compounds; D002593:Cetrimonium Compounds; D012235:Rhodamines; D013438:Sulfhydryl Compounds; C026188:rhodamine 6G; D012834:Silver; C064316:4-aminothiophenol; D004247:DNA; D000077286:Cetrimonium