Abstract
Aligned silver nanorods wrapped with Al2O3 layers about 0.85, 1.54 nm thickness were utilized to study the SERS response and adsorption behavior of uranyl ion. Relatively broad and asymmetric SERS bands were observed due to the contribution of several hydrolyzed uranyl complexes and multiple coordination between uranyl complexes and SERS substrates. The mechanism of sorption on SERS substrates is discussed. The effect of the pH value of sample solutions was also studied. Results show that the Al2O3 layers enhance the stability of silver nanorod. It is found that the Al2O3 layer is consumed in acidic or basic solutions, while the SERS performance of silver nanord is maintained. Uranyl ion can be quantified by this method in concentration down to 10−9 M.
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