A carbon silver nano-assembly was prepared from silver nanoparticles and carbon dots (AgNP@CD). It was used to quantify hydrogen peroxide and glucose by UV-visible spectroscopy. Banana peels were used to prepare the CDs by a microwave-assisted method. The CDs can be prepared within 5 min at 700 W. They act as (a) substrate, (b) stabilizer, and (c) reductant to convert silver ions to AgNPs. The nano-assembly was characterized by UV-visible spectroscopy, Fourier-transform infrared spectroscopy, atomic force microscopy, and transmission electron microscopy. The CDs have a particle size of 1.4 nm. Photoexcitation of the CDs with a UV lamp of 365 nm results in blue fluorescence. The absorption spectra of the CDs show a peak at 205 nm along the wide shoulder absorption band. On incorporation of the Ag nanoparticles into the CDs matrix, the color of the CDs turns into yellow and an additional absorbance peak at 408 nm appears. FTIR spectroscopy shows that different functional groups are present on the CDs. They are responsible for the stabilization of the AgNPs. On exposure to H 2 O 2 , the color of the nano-assembly disappears gradually. Hence, the assembly can be used as a colorimetric indicator probe for H 2 O 2 with a linear response in the 0.1-100 μM concentration range. It can also be applied to the determination of glucose by using glucose oxidase which causes the formation of H 2 O 2 from glucose. The linear response ranges from 1- 600 μM. The detection limits for H 2 O 2 and glucose are 9 nM and 10 nM, respectively. In our perception, this is the lowest detection limit reported so far. The AgNP@CD nano-assembly does not respond to saccharides, maltose, fructose, and lactose. It can be used to quantify glucose in diluted blood plasma. Graphical abstract Schematic representation of microwave-assisted synthesis of AgNP@CDs with enhanced-peroxidase like activity for colorimetric determination of hydrogen peroxide and glucose.

中文翻译：

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微波辅助合成碳点作为银纳米粒子的还原剂和稳定剂，具有增强的过氧化物酶样活性，用于比色测定过氧化氢和葡萄糖

由银纳米颗粒和碳点（AgNP@CD）制备碳银纳米组件。它用于通过紫外-可见光谱定量过氧化氢和葡萄糖。香蕉皮用于通过微波辅助方法制备 CD。CDs 可以在 700 W 下在 5 分钟内制备。它们充当 (a) 底物、(b) 稳定剂和 (c) 还原剂以将银离子转化为 AgNPs。通过紫外可见光谱、傅里叶变换红外光谱、原子力显微镜和透射电子显微镜对纳米组件进行了表征。CD 的粒径为 1.4 nm。用 365 nm 紫外灯对 CD 进行光激发会产生蓝色荧光。CD 的吸收光谱沿着宽肩吸收带在 205 nm 处显示峰值。在将 Ag 纳米粒子掺入 CDs 基质中时，CD 的颜色变为黄色，并在 408 nm 处出现一个额外的吸收峰。FTIR 光谱显示 CD 上存在不同的官能团。它们负责稳定 AgNP。在暴露于 H 2 O 2 时，纳米组件的颜色逐渐消失。因此，该组件可用作 H 2 O 2 的比色指示探针，在 0.1-100 μM 浓度范围内具有线性响应。它也可用于通过使用葡萄糖氧化酶从葡萄糖中形成H 2 O 2 来测定葡萄糖。线性响应范围为 1-600 μM。H 2 O 2 和葡萄糖的检测限分别为 9 nM 和 10 nM。在我们看来，这是迄今为止报告的最低检测限。AgNP@CD 纳米组装体对糖类、麦芽糖、果糖、和乳糖。它可用于量化稀释血浆中的葡萄糖。图形摘要 微波辅助合成具有增强过氧化物酶样活性的 AgNP@CDs 的示意图，用于比色测定过氧化氢和葡萄糖。