Fig. 6
From: Graphene quantum dot nanocomposites: electroanalytical and optical sensor technology perspective
(Reproduced with permission from Ref. Xu et al. 2018, Copyright 2018, Elsevier)
a Schematic representation of GQDs assembly and AuPd-ANPs decorated GQDs assembly formation. Step 1: Electrodeposition of GQDs on ACF with [BMIM]OTF as the electrolyte to form a close-pack GQDs assembly; Step 2: Electrodeposition of AuPd-ANPs on GQDs on ACF. b CV curves of AuPd-ANPs/GQDs/ACF, Au-NPs/GQDs/ACF, and Pd-NPs/GQDs/ACF microelectrodes in 0.5 M H2SO4. Scan rate: 50 mV s−1. c CV curves of AuPd-ANPs/GQDs/ACF, AuPd-ANPs/ACF, and GQDs/ACF microelectrodes in 0.1 M PBS solution containing 5 mM H2O2. Scan rate: 50 mV s−1. d CV curves of AuPd-ANPs/GQDs/ACF, Pd-NPs/GQDs/ACF, and Au-NPs/GQDs/ACF microelectrodes in 0.1 M PBS solution containing 5 mM H2O2. Scan rate: 50 mV s−1. e CV curves of AuPd-ANPs/GQDs/ACF electrode in 0.1 M PBS solution containing 0, 2, 5, and 10 mM H2O2. Scan rate: 50 mV s−1. f Typical amperometric response of AuPd-ANPs/GQDs/ACF microelectrode to successive addition of different H2O2 concentrations into 0.1 M PBS solution under stirring. Inset of f is the amperometric response of AuPd-ANPs/GQDs/ACF electrodes at low concentrations. Applied potential: 0.05 V. g Amperometric response of AuPd-ANPs/GQDs/ACF to successive addition of 0.1 mM H2O2 and 0.1 mM UA, GLU, AA, and DA in 0.1 M PBS. Applied potential: 0.05 V.