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One-step synthesis of graphene-AuNPs by HMTA and the electrocatalytical application for O2 and H2O2.

Talanta (2012-04-10)
Jianguo Hu, Fenghua Li, Kaikai Wang, Dongxue Han, Qixian Zhang, Junhua Yuan, Li Niu
ABSTRACT

A green, one-step method for synthesis of graphene-Au nanoparticles (graphene-AuNPs) was introduced in this article, using an environmentally benign hexamethylenetetramine (HMTA) as reducing and stabilizing agent. HMTA slowly was hydrolyzed to generate aldehyde ammonia to reduce graphene oxides (GO) and hydrogen tetrachloroaurate (Au precursor). The structure and composition of the graphene-AuNPs nanocomposites were studied by means of ultraviolet visible (UV) absorption spectra, X-ray photoelectron spectroscopy (XPS) and Transmission electron microscopy (TEM). The AuNPs are well-dispersed on graphene nanosheets in narrow size range. The nanocomposites have excellent electrocatalytical properties for catalytic reduction of O(2) and H(2)O(2).

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Hexamethylenetetramine, ReagentPlus®, 99%
Sigma-Aldrich
Hexamethylenetetramine, ACS reagent, ≥99.0%
Sigma-Aldrich
Hexamethylenetetramine, meets analytical specification of Ph. Eur., BP, 99-100.5% (calc. to the dried substance)
Sigma-Aldrich
Hexamethylenetetramine, puriss. p.a., reag. Ph. Eur., ≥99.5% (calc. to the dried substance)
Methenamine, European Pharmacopoeia (EP) Reference Standard
Supelco
Hexamethylenetetramine