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. 2020 Apr 24;13(8):1999.
doi: 10.3390/ma13081999.

Novel Graphene/In2O3 Nanocubes Preparation and Selective Electrochemical Detection for L-Lysine of Camellia nitidissima Chi

Jinsheng Cheng  1 , Sheng Zhong  2 , Weihong Wan  1   3 , Xiaoyuan Chen  1 , Ali Chen  4 , Ying Cheng  3
Affiliations

Novel Graphene/In2O3 Nanocubes Preparation and Selective Electrochemical Detection for L-Lysine of Camellia nitidissima Chi

Jinsheng Cheng et al. Materials (Basel). .

Abstract

In this work, novel graphene/In2O3 (GR/In2O3) nanocubes were prepared via one-pot solvothermal treatment, reduction reaction, and successive annealing technology at 600 °C step by step. Interestingly, In2O3 with featured cubic morphology was observed to grow on multi-layered graphene nanosheets, forming novel GR/In2O3 nanocubes. The resulting nanocomposites were characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction spectroscopy (XRD), etc. Further investigations demonstrated that a selective electrochemical sensor based on the prepared GR/In2O3 nanocubes can be achieved. By using the prepared GR/In2O3-based electrochemical sensor, the enantioselective and chem-selective performance, as well as the optimal conditions for L-Lysine detection in Camellia nitidissima Chi, were evaluated. The experimental results revealed that the GR/In2O3 nanocube-based electrochemical sensor showed good chiral recognition features for L-lysine in Camellia nitidissima Chi with a linear range of 0.23-30 μmol·L-1, together with selectivity and anti-interference properties for other different amino acids in Camellia nitidissima Chi.

Keywords: Camellia nitidissima Chi; L-Lysine; detection; graphene/In2O3 cubes.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Scheme 1
Scheme 1
Synthesis of GR/In2O3 nanocubes.
Figure 1
Figure 1
(a,b) TEM of GR/In2O3 nanocubes; (c,d) HRTEM of GR/In2O3 nanocubes, inserted image in (c) was electron diffraction of the prepared GR/In2O3 nanocubes.
Figure 2
Figure 2
(A) XRD spectra of (a) graphene, (b) GR/In(OH)3 intermediate, and (c) GR/In2O3 nanocubes; (B) energy dispersive spectroscopy (EDS) analysis of GR/In2O3 nanocubes.
Figure 3
Figure 3
Mechanism for the synthesis of the GR/In2O3 nanocubes.
Scheme 2
Scheme 2
Schematic diagram of GR/In2O3 nanocube-based selective electrochemical sensor for L-Lysine of Camellia nitidissima Chi.
Figure 4
Figure 4
Current responses obtained by GR/In2O3 nanocube-based electrochemical sensor of amino acids extraction in Camellia nitidissima Chi (extra addition D-Lys with a concentration of 0.45%), applied potential: 0.85 V.
Figure 5
Figure 5
Differential pulse voltammetry (DPV) responses of L-Lys by (a) electrode without GR/In2O3 nanocubes; (b) GR/In2O3 nanocube-based electrochemical sensor.
See this image and copyright information in PMC

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