Influence of gold nanostructures incorporated into sodium montmorillonite clay based on LbL films for detection of metal traces ions

Author(s)

de Almeida, Jessica Cristina ^[1] ; de Barros, Anerise ^[2] ; Mazali, Italo Odone ^[2] ; Ferreira, Marystela ^[1]

Affiliation

^[1] Univ Fed Sao Carlos UFSCar, Campus Sorocaba, Sao Carlos - Brazil

^[2] Univ Estadual Campinas, Inst Chem, Lab Funct Mat, POB 6154, BR-13083970 Campinas, SP - Brazil

• Document type: Journal article
• Source: Applied Surface Science; v. 507, MAR 30 2020.
• Web of Science Citations: 0

Abstract

We report the effects of different gold nanostructures incorporated into sodium montmorillonite clay mineral (Na+-MMT) through thin films based on electrostatic interactions. The nanocomposite films were fabricated by layer-by-layer (LbL) technique using gold nanosphere (AuNSs) and gold nanorods (AuNRs) as cationic colloidal solutions, interacting with Na+-MMT clay as anionic dispersion. Higher performance was evaluated from electrochemical measurements for the detection of metal ions traces (Cd2+ and Cu2+). The interactions between materials were confirmed by UV-vis and FTIR spectroscopies and the effects of the Au nanostructures shape on Na+-MMT clay structures properties are confirmed by X-ray diffraction patterns. The results demonstrate that the AuNRs increase the lamellar space of Na+-MMT clay, consequently, increasing the roughness and favoring directly electrochemical response, with higher sensitivity and lower limits detection. Recovery was found to be 98.1% for cadmium but as high as 103.1% for copper, indicating that the modified electrode provides excellent reproducibility, stability, and promising applicability in the real water sample. (AU)

• FAPESP's process: 16/19387-0 - LbL (LAYER-BY-LAYER) and Langmuir-Blodgett (LB) nanostructured films with emodin for systems carriers.
• Grantee: Marystela Ferreira
• Support Opportunities: Regular Research Grants