GOLD NANOPARTICLE-BASED PH SENSOR IN HIGHLY ALKALINE REGION BY SURFACE-ENHANCED RAMAN SCATTERING STUDY

摘要

A pH sensor for a highly alkaline region of pH is more than 11 is provided to enable the measurement of more exact pH and quantify pH in a highly alkaline region, as compared with the conventional sensor. A pH sensor for a highly alkaline region of pH is more than 11 comprises gold nanoparticles reduced by citrate. A method for quantifying pH of a solution in the highly alkaline region of pH is more than 11 includes the steps of: adding the gold nanoparticles reduced by citrate to a sample to need pH quantification, wherein the gold nanoparticles have self-assembled monolayers on the surfaces, which are formed by a compound containing an acetylene group and a pyridine ring as anchoring groups; obtaining the surface-enhanced Raman scattering spectrum from the sample; and measuring v(C=C) stretching band intensity from the spectrum, and quantifying pH of a solution based on the result.