贵金属装饰二维 MoS2 纳米薄片的显着气敏选择性,ACS Nano

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贵金属装饰二维 MoS2 纳米薄片的显着气敏选择性
ACS Nano ( IF 15.8 ) Pub Date : 2023-02-24 , DOI: 10.1021/acsnano.2c09733
Taehoon Kim ₁ , Tae Hyung Lee ₁ , Seo Yun Park ₁ , Tae Hoon Eom ₁ , Incheol Cho ₂ , Yeonhoo Kim ₃ , Changyeon Kim ₁ , Sol A Lee ₁ , Min-Ju Choi ₁ , Jun Min Suh _{1,

4} , In-Sung Hwang ₅ , Donghwa Lee ₆ , Inkyu Park ₂ , Ho Won Jang _{1,

7}

Affiliation

贵金属纳米粒子装饰是增强选择性的代表性策略，用于制造基于二维 (2D) 半导体材料的化学传感器阵列，以二硫化钼 (MoS ₂ ) 为代表。然而，贵金属装饰对二维材料的选择性调节机制尚未完全阐明。在这里，我们成功地通过溶液工艺在不使用还原剂的情况下在 MoS ₂薄片上装饰了贵金属纳米粒子。_二硫化钼薄片在表面装饰后表现出剧烈的选择性变化，并清楚地区分氨气、氢气和乙醇气体，这在一般的 3D 金属氧化物纳米结构中是观察不到的。通过第一性原理密度泛函理论 (DFT) 计算研究了贵金属纳米粒子装饰对选择性变化的作用。虽然 H ₂灵敏度与计算的结合能显示出相似的趋势，但 NH ₃的灵敏度与结合位点失活密切相关，这是由于 MoS _{2处优选的贵金属颗粒装饰}边缘。这一发现是一种特殊现象，源于二维材料的独特结构，具有高度活跃的边缘位点。我们相信，我们的研究将为设计基于二维材料的高效传感器阵列的策略提供基本的理解。

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Drastic Gas Sensing Selectivity in 2-Dimensional MoS2 Nanoflakes by Noble Metal Decoration

Noble metal nanoparticle decoration is a representative strategy to enhance selectivity for fabricating chemical sensor arrays based on the 2-dimensional (2D) semiconductor material, represented by molybdenum disulfide (MoS₂). However, the mechanism of selectivity tuning by noble metal decoration on 2D materials has not been fully elucidated. Here, we successfully decorated noble metal nanoparticles on MoS₂ flakes by the solution process without using reducing agents. The MoS₂ flakes showed drastic selectivity changes after surface decoration and distinguished ammonia, hydrogen, and ethanol gases clearly, which were not observed in general 3D metal oxide nanostructures. The role of noble metal nanoparticle decoration on the selectivity change is investigated by first-principles density functional theory (DFT) calculations. While the H₂ sensitivity shows a similar tendency with the calculated binding energy, that of NH₃ is strongly related to the binding site deactivation due to preferred noble metal particle decoration at the MoS₂ edge. This finding is a specific phenomenon which originates from the distinguished structure of the 2D material, with highly active edge sites. We believe that our study will provide the fundamental comprehension for the strategy to devise the highly efficient sensor array based on 2D materials.

更新日期：2023-02-24

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