Premium
Core/Shell Au/MnO Nanoparticles Prepared Through Controlled Oxidation of AuMn as an Electrocatalyst for Sensitive H 2 O 2 Detection
Author(s) -
Zhu Huiyuan,
Sigdel Aruna,
Zhang Sen,
Su Dong,
Xi Zheng,
Li Qing,
Sun Shouheng
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201406281
Subject(s) - nanoparticle , dispersity , electrochemistry , electrocatalyst , manganese , annealing (glass) , detection limit , materials science , hydride , chemical engineering , alloy , chemistry , nanotechnology , nuclear chemistry , electrode , metal , metallurgy , polymer chemistry , chromatography , engineering
Monodisperse 5 nm AuMn nanoparticles were synthesized by hydride reduction of manganese acetylacetonate in the presence of Au nanoparticles. The alloy was formed through fast Mn diffusion into the Au structure. The AuMn nanoparticles were converted to Au‐MnO composite particles through air annealing at 170 °C. These Au‐MnO particles, especially the core/shell Au/MnO nanoparticles, were active for the electrochemical reduction of H 2 O 2 , with a detection limit reaching 8 n M . This highly sensitive electrochemical sensor based on the Au/MnO nanoparticles was used to monitor H 2 O 2 concentrations released from living cells, from which tumorigenic cells were discovered to release higher levels of H 2 O 2 than the non‐tumorigenic cells.