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RSC Advances · 2024 ·Vol. 14 ·期 20 ·13808-13816 · IF 3.9

Colorimetric detection of Hg2+ based on the enhanced oxidase-mimic activity of CuO/Au@Cu3(BTC)2 triggered by Hg2+

Min Yang,Jian Wang,Xuan Xue,Hechun Jiang

It is imperative to develop a rapid detection method for Hg2+ due to its harm to human health and the ecological environment. In this research, CuO/Au@Cu3(BTC)2 was synthesized through reducing HAuCl4 by CuxO@Cu3(BTC)2, which was obtained by reducing Cu3(BTC)2 with hydrazine hydrate. The oxidase-mimic activity of CuO/Au@Cu3(BTC)2 can be enhanced by Hg2+ through forming a Au–Hg alloy. Therefore, a colorimetric method was designed for Hg2+ detection with a linear relationship in the 0.05–25 μM range and a limit of detection of 9.7 nM. This strategy exhibited a strong selectivity to Hg2+ and was applied in a real water sample with reliable recoveries. This work provides a possibility for the rapid detection of Hg2+.

CAS / MDL: 64-19-7 127-09-3 16961-25-4 528-44-9 54827-17-7

研究领域: 环境科学 · 分析化学

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Nature Communications · 2024 ·Vol. 15 ·期 1 ·1-8 · IF 14.7

Direct observation of tunable thermal conductance at solid/porous crystalline solid interfaces induced by water adsorbates

Wang Guang,Fan Hongzhao,Li Jiawang,Li Zhigang,Zhou Yanguang

Improving interfacial thermal transport is crucial for heat dissipation in devices with interfaces, such as electronics, buildings, and solar panels. Here, we design a strategy by utilizing the water adsorption-desorption process in porous metal-organic frameworks (MOFs) to tune the interfacial heat transfer, which could benefit their potential in cooling or heat dissipation applications. We observe a changeable thermal conductance across the solid/porous MOF interfaces owing to the dense water channel formed by the adsorbed water molecules in MOFs. Our experimental and/or modeling results show that the interfacial thermal conductance of Au/Cu 3 (BTC) 2 , Au/Zr 6 O 4 (OH) 4 (BDC) 6 and Au/MOF-505 heterointerfaces is increased up to 7.1, 1.7 and 3.1 folds by this strategy, respectively, where Cu 3 (BTC) 2 is referred to as HKUST-1 and Zr 6 O 4 (OH) 4 (BDC) 6 is referred to as UiO-66. Our molecular dynamics simulations further show that the surface tension of Au layer will cause the adsorbed water molecules in MOFs to gather at the interfacial region. The dense water channel formed at the interfacial region can activate the high-frequency lattice vibrations and act as an additional thermal pathway, and then enhance heat transfer across the interfaces significantly. Our findings revealed the underlying mechanisms for tailoring thermal transport at the solid/porous MOF heterointerfaces by water adsorbates, which could motivate and benefit the new cooling system design based on MOFs.

研究领域: 材料科学 · 热能工程 · 纳米技术 · 表面科学

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Colorimetric detection of Hg2+ based on the enhanced oxidase-mimic activity of CuO/Au@Cu3(BTC)2 triggered by Hg2+

Direct observation of tunable thermal conductance at solid/porous crystalline solid interfaces induced by water adsorbates