期刊
TALANTA
卷 178, 期 -, 页码 962-969出版社
ELSEVIER
DOI: 10.1016/j.talanta.2017.09.060
关键词
Carboxylated graphene oxide; AuNPs; Zinc monoamino porphyrin; Photoelectrochemical sensor; 4-nitrophenol
资金
- National Natural Science Foundation of China [21175108, 21327005]
- Program for Chang Jiang Scholars and Innovative Research Team, Ministry of Education, China [IRT1283]
- Program of Innovation and Entrepreneurial for Talent, Lan Zhou, Gansu Province [2014-RC-39]
The GO-COOH/AuNPs/ZnAPTPP nanocomposites were constructed using zinc monoamino porphyrin (ZnAPTPP) through pi-pi conjugation with carboxylated graphene oxide (GO-COOH) loaded with Au nano particles (AuNPs). Prepared materials were characterized by H-1 NMR spectra, UV-vis absorption spectroscopy and electrochemical impedance spectroscopy. ITO electrode surface was modified with the prepared nano composites showed a good photocurrent response when the bias potential, -0.1 V was applied. Nanocomposites modified ITO electrode exhibited good photo-response to the 4-nitrophenol (4-NP). ZnAPTPP were excited from HOMO to LUMO under light irradiation, the photoexcited electrons injected into the conduction band of GO-COOH, and then transferred to AuNPs further to the ITO. The presence of GO-COOH and AuNPs improved the separation of photogenerated charges due to their synergetic effect and excellent conductivity. Externally added 4-NP scavenges the photogenerated holes i.e. it acts as a sacrificial electron donor thereby it enhances the photocurrent of the system. Based on this interaction, a novel method for photoelectrochemical detection of 4-NP was developed with a linear range from 0.1 to 15 nmol/L (r = 0.996) and detection limit of 0.04 nmol/L (S/N = 3). Proposed method is simple and sensitive and this was successfully applied for the quantification 4-NP in river water sample matrices.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据