title: Plasma-induced formation of Ag nanodots for ultra-high-enhancement surface-enhanced Raman scattering substrates.
abstract: We report here plasma-induced formation of Ag nanostructures for surface-enhanced Raman scattering (SERS) applications. An array of uniform Ag patterned structures of 150 nm diameter was first fabricated on a silicon substrate with imprint lithography; then the substrate was further treated with an oxygen plasma to fracture the patterned structures into clusters of smaller, interconnected, closely packed Ag nanoparticles (20-60 nm) and redeposited Ag nanodots ( approximately 10 nm) between the clusters. The substrate thus formed had a uniform ultrahigh SERS enhancement factor (1010) over the entire substrate for 4-mercaptophenol molecules. By comparison, Au patterned structures fabricated with the same method did not undergo such a morphological change after the plasma treatment and showed no enhancement of Raman scattering.
authors: Quantum Science Research, Hewlett-Packard Laboratories, 1501 Page Mill Road, Palo Alto, California 94304, USA. zhiyong.li@hp.com
authors: Zhiyong
authors: Z
authors: Li
authors: William M
authors: WM
authors: Tong
authors: William F
authors: WF
authors: Stickle
authors: David L
authors: DL
authors: Neiman
authors: R Stanley
authors: RS
authors: Williams
authors: Luke L
authors: LL
authors: Hunter
authors: A Alec
authors: AA
authors: Talin
authors: D
authors: D
authors: Li
authors: S R J
authors: SR
authors: Brueck
mesh_terms: D000327:Adsorption; D049329:Nanostructures / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D010316:Particle Size; D010636:Phenols / Q000737:chemistry*; D012680:Sensitivity and Specificity; D012825:Silicon / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D013499:Surface Properties
chemical_list: C505584:4-mercaptophenol; D010636:Phenols; D013438:Sulfhydryl Compounds; D012834:Silver; D010100:Oxygen; D012825:Silicon