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<p>Copper nanocrystal has been widely used as nanozyme for construction of optical sensing platforms because of low cost, special catalysis, and high stability. However, low catalytic activity limits further applications in bioanalysis. This study reports one way for improving the catalytic activity of copper nanocrystal by introducing Ti<sub>3</sub>C<sub>2</sub>T<sub>X</sub> and arginine and serine-functionalized graphene quantum dot (RSGQD). Cu<sup>2+</sup> was reduced by RSGQD to produce copper nanocrystal, which was immobilized on Ti<sub>3</sub>C<sub>2</sub>T<sub>X</sub> sheet via π-π stacking and self-assembly. The resulted Ti<sub>3</sub>C<sub>2</sub>T<sub>X</sub>/Cu-RSGQD shows a three-dimensional structure composing of small copper nanocrystals with an average particle size of 18.1 ± 1.7&#xa0;nm and Ti<sub>3</sub>C<sub>2</sub>T<sub>X</sub> sheets. The introduction of Ti<sub>3</sub>C<sub>2</sub>T<sub>X</sub> and RSGQD improves the catalytic activity due to good conductivity of Ti<sub>3</sub>C<sub>2</sub>T<sub>X</sub> and formation of Ti<sub>3</sub>C<sub>2</sub>T<sub>X</sub>/RSGQD/Cu Schottky heterojunction. The peroxidase-like and oxidase-like specific activities reach 591.61 U mg<sup>−1</sup> and 105.2 U mg<sup>−1</sup>. Based on the catalysis of Ti<sub>3</sub>C<sub>2</sub>T<sub>X</sub>/Cu-RSGQD towards oxidation of 3,3′,5,5′-tetramethylbenzidine into a&#xa0;blue product, a&#xa0;sensitive method was developed for colorimetric detection of H<sub>2</sub>O<sub>2</sub>. The absorbance linearly increases with increasing H<sub>2</sub>O<sub>2</sub> concentration between 0 and 50&#xa0;μM with a&#xa0;detection limit of 0.0032&#xa0;μM (S/N = 3). The sensitivity is better than that of other&#xa0;reported analytical methods. It has been contentedly applied in colorimetric detection of H<sub>2</sub>O<sub>2</sub> in food.</p> Graphical abstract <p></p>

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Significantly improved catalytic activity of copper nanocrystal by introducing Ti3C2TX and arginine and serine-functionalized graphene quantum dot for colorimetric detection of H2O2

  • 期刊论文

  • 发表日期：

    2025年3月13日

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  • Ji Min,
  • Li Ruiyi,
  • Li Zaijun

摘要

Copper nanocrystal has been widely used as nanozyme for construction of optical sensing platforms because of low cost, special catalysis, and high stability. However, low catalytic activity limits further applications in bioanalysis. This study reports one way for improving the catalytic activity of copper nanocrystal by introducing Ti3C2TX and arginine and serine-functionalized graphene quantum dot (RSGQD). Cu2+ was reduced by RSGQD to produce copper nanocrystal, which was immobilized on Ti3C2TX sheet via π-π stacking and self-assembly. The resulted Ti3C2TX/Cu-RSGQD shows a three-dimensional structure composing of small copper nanocrystals with an average particle size of 18.1 ± 1.7 nm and Ti3C2TX sheets. The introduction of Ti3C2TX and RSGQD improves the catalytic activity due to good conductivity of Ti3C2TX and formation of Ti3C2TX/RSGQD/Cu Schottky heterojunction. The peroxidase-like and oxidase-like specific activities reach 591.61 U mg−1 and 105.2 U mg−1. Based on the catalysis of Ti3C2TX/Cu-RSGQD towards oxidation of 3,3′,5,5′-tetramethylbenzidine into a blue product, a sensitive method was developed for colorimetric detection of H2O2. The absorbance linearly increases with increasing H2O2 concentration between 0 and 50 μM with a detection limit of 0.0032 μM (S/N = 3). The sensitivity is better than that of other reported analytical methods. It has been contentedly applied in colorimetric detection of H2O2 in food.

Graphical abstract