Abstract
In this work, chemical vapor deposition (CVD) method-grown graphene on plasma-etched quartz glass supported platinum nanoparticles (PtNPs/eQG) was constructed as an independent transparent electrode for non-enzymatic hydrogen peroxide (H2O2) detection. Graphene grown on quartz glass by the CVD method can effectively reduce the wrinkles and pollution caused by traditional transfer methods. The addition of the CF4 plasma-etched process accelerates the growth rate of graphene on quartz glass. The platinum nanoparticles (PtNPs) prepared by in situ sputtering have favorable dispersibility and maximize exposed active catalytic sites on graphene, providing performance advantages in the application of H2O2 detection. The resulting sensor's detection limit (3.3 nM, S/N = 3), detection linear range (10 nM to 80 μM) and response time (less than 2 s) were significantly superior to other graphene supported PtNPs materials in sensing of H2O2. In addition, the material preparation method was related to the non-transfer CVD method and in situ sputtering technology, allowing for the creation of independent electrodes without additional electrode modification processes. This primitive material preparation and electrode assembly process were promoted for the application and development of practical H2O2 sensors.
Highlights
Hydrogen peroxide (H2O2) is an important intermediate in the chemical industry and a signi cant indicator of major diseases such as cancer, Alzheimer's disease and Parkinson's disease.[1,2] The accurate detection of low concentrations of H2O2 has important practical signi cance in the elds of clinical medicine, environment and food testing
The prepared Pt nanoparticles/ graphene grown on plasma-etched quartz glass is denoted as platinum nanoparticles (PtNPs)/eQG
Platinum nanoparticles loaded on plasma-etched quartz glass (PtNPs/eQ)
Summary
Hydrogen peroxide (H2O2) is an important intermediate in the chemical industry and a signi cant indicator of major diseases such as cancer, Alzheimer's disease and Parkinson's disease.[1,2] The accurate detection of low concentrations of H2O2 has important practical signi cance in the elds of clinical medicine, environment and food testing. The sensitivity, selectivity and stability of electrochemical sensors are strongly dependent on the structure and performance of the electrode materials.[10] Graphene, a twodimensional carbon nanomaterial,[11] is widely used as a transparent electrode because of its large surface area, excellent conductivity, ultra-high optical transparency and chemical stability.[12,13] At the same time, noble metal nanoparticles, with large surface-to-volume ratio, extraordinary conductivity and high catalytic performance, have been widely applied in the electrochemical sensing elds.[14,15,16,17,18,19] What's more, platinum nanoparticles (PtNPs) have higher catalytic ability and stability for the detection of H2O2 due to their lower oxidation/reduction overvoltage.[20] graphene supported PtNPs has attracted great attention for non-enzymatic detection of H2O2 due to favorable properties of graphene as transparent electrodes and ultra-high detection performance of PtNPs.[21] For example, Selvakumar Palanisamy[22] et al reported a single step electrochemical fabrication of a platinum nanoparticle decorated reduced graphene oxide (RGO–PtNPs) composite for enhanced electrochemical sensing of H2O2 It was linear over the concentration ranging from 0.05 to 750.6 mM with the limit of detection of 16 nM. Graphene grown on plasma-etched quartz glass (eQG) combined with sputtered Pt nanoparticles (PtNPs) were used as independent electrodes to assemble electrochemical sensors for non-enzymatic detection of low concentration of H2O2
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