TY - JOUR
T1 - Surface-immobilized polyampholytic silver nanoparticles for SERS detection of cations and anions in aqueous solutions
AU - Tan, Siliu
AU - Pristinski, Denis
AU - Sukhishvili, Svetlana
AU - Du, Henry
PY - 2005
Y1 - 2005
N2 - A new procedure was used for the preparation of stable silver colloids by reduction of silver nitrate with (N-(2-hydroxyethyl) piperazine-N′-2-ethanesulfonic acid (HEPES). The nanoparticle size and the surface charge could be tuned by changing the initial pH of a HEPES solution. Rhodamine 60 and NaSCN were used respectively as model cationic and anionic analytes to study the effect of surface charge of the silver colloids on detection sensitivity. The silver colloids exhibit SERS activity comparable to those obtained by the popular Lee-Meisel approach. The combination of the high SERS sensitivity and the ability to control the nature of surface charge renders HEPES-reduced polyampholytic silver colloids a potentially powerful platform for sensing and detection of both cations and anions in aqueous solutions.
AB - A new procedure was used for the preparation of stable silver colloids by reduction of silver nitrate with (N-(2-hydroxyethyl) piperazine-N′-2-ethanesulfonic acid (HEPES). The nanoparticle size and the surface charge could be tuned by changing the initial pH of a HEPES solution. Rhodamine 60 and NaSCN were used respectively as model cationic and anionic analytes to study the effect of surface charge of the silver colloids on detection sensitivity. The silver colloids exhibit SERS activity comparable to those obtained by the popular Lee-Meisel approach. The combination of the high SERS sensitivity and the ability to control the nature of surface charge renders HEPES-reduced polyampholytic silver colloids a potentially powerful platform for sensing and detection of both cations and anions in aqueous solutions.
KW - HEPES
KW - NaSCN
KW - Rhodamine 6G
KW - SERS
KW - Sensing
KW - Silver nanoparticles
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U2 - 10.1117/12.630669
DO - 10.1117/12.630669
M3 - Conference article
AN - SCOPUS:33644698721
SN - 0277-786X
VL - 6008
JO - Proceedings of SPIE - The International Society for Optical Engineering
JF - Proceedings of SPIE - The International Society for Optical Engineering
M1 - 600808
T2 - Nanosensing: Materials and Devices II
Y2 - 23 October 2005 through 26 October 2005
ER -