Detection of trace mercury ions in water with a bovine-serum-albumin-modified Au@SiNWA surface-enhanced-Raman-scattering sensor
Author(s): Fan, CS (Fan, Chengshan); Zhang, X (Zhang, Xin); Lv, JM (Lv, Jia Meng); Bai, JH (Bai, Jiahao); Qiu, ZH (Qiu, Zenghui); Zhao, YM (Zhao, Yong Mei); Wu, ZL (Wu, Zheng Long); Xu, HJ (Xu, Hai Jun)
Source: ANALYTICAL METHODS DOI: 10.1039/d1ay00639h Early Access Date: JUN 2021
Abstract: Accurate detection of mercury ions (Hg2+) in water is of great importance for environmental protection. Here, a surface-enhanced Raman scattering (SERS) sensor using bovine-serum-albumin-modified gold-silicon nanowire arrays (Au@SiNWAs) is used to detect the ions. The SiNWAs were grown via chemical etching; the addition of modified gold particles on the surface formed Au@SiNWAs to increase the surface activity. The Raman enhancement factor was as large as similar to 2.52 x 10(5), which was also confirmed with finite-difference time-domain simulations. The detection limit for Hg2+ ions in water was as low as similar to 10(-12) M, which is much lower than that stipulated by the United States Environmental Protection Agency's maximum residue requirements for drinking water. Furthermore, the SERS intensity was linear with the log of the Hg2+ concentration between 1 pM and 100 nM, with a correlation coefficient of 0.992. There was no significant interference when other metal ions were present, which shows the excellent selectivity of the SERS sensor. Unknown Hg2+ concentrations in water can be readily determined in an accurate and reliable manner, with a relative standard deviation of similar to 9.21%.
Accession Number: WOS:000669579100001
PubMed ID: 34223572