Preparation of Gold Nanoplates Using Ortho Carbonyl Compounds as Capping Agents for Electrochemical Sensing of Lead Ions

• Published in: Nanoscale research letters 2021-04, Vol.16 (1), p.57-57, Article 57
• Main Authors: Jiang, Xinde, Ma, Jianye, Jiang, Guixian, Xu, Manqing, Huang, Xueping, Gao, Guiqing, Dai, Xin
• Format: Article
• Language: English
• Subjects: Capping; Carbonyl compounds; Carbonyls; Chemical synthesis; Chemistry and Materials Science; Electrochemistry; Electrodes; Gallic acid; Glassy carbon; Gold; Heavy metals; Ion concentration; Ions; Lead; Materials Science; Metal concentrations; Metal industry wastewaters; Molecular Medicine; Nano Express; Nanochemistry; Nanoparticle; Nanoparticles; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; Organic compounds; Oxygen atoms; Seeds; Wastewater
• ISSN: 1931-7573; 1556-276X; 1556-276X
• DOI: 10.1186/s11671-021-03521-2

In this study, gold nanoplates were synthesized using plant molecules (gallic acid) following a kinetic control mode. The growth of nanoplates is mainly due to the specific adsorption of capping agents on certain crystal facets. Through systematical characterizations, it is found that the distance between two oxygen atoms in ortho carbonyl compounds matches well with the lattice spacing of gold (111) facets exactly, which is beneficial to the formation of twin seeds and further the growth of plate-like gold nanoparticles. The gold nanoplates on glassy carbon electrode show a remarkably improved electrochemical sensing activity of lead ions compared to the bare glassy carbon electrode or spherical gold nanoparticle-modified electrode. The modified electrode is expected to be used in the detection of lead ion concentration in heavy metal wastewater.