通过将金属-有机骨架纳米片与配位不饱和的 Ni(II) 位点耦合，提高 g-C3N4 用于 NO2 气体光电检测的性能,ACS Applied Materials & Interfaces

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通过将金属-有机骨架纳米片与配位不饱和的 Ni(II) 位点耦合，提高 g-C3N4 用于 NO2 气体光电检测的性能
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-02-24 , DOI: 10.1021/acsami.3c00903
Wenting Ji ₁ , Fan Yang ₁ , Jianhui Sun _{1,

2} , Rongping Xu ₁ , Peng Li _{1,

2} , Liqiang Jing ₁

Affiliation

使用 gC ₃ N _{4 (CN) 对 NO}₂进行灵敏和选择性光电检测至关重要，但实现超低浓度（ppb 级）检测仍然具有挑战性。在此，Ni 金属有机骨架/CN 纳米片异质结通过静电诱导组装策略成功制备，然后通过碱后蚀刻工艺处理以产生配位不饱和的 Ni(II) 位点。_{优化后的异质结对 NO 2}的检测限度达到创纪录的 1 ppb，远低于在原始 CN 上观察到的值，并且对其他气体具有出色的选择性，并且在室温下具有长期稳定性（120 天）。_{由此产生的优越检测性能得益于紧密接触的异质结界面增强的电荷转移和分离以及不饱和 Ni(II) 作为选择性吸附位点对 NO 2}的有利吸附，主要通过时间分辨光致发光光谱和原位X -射线光电子能谱。此外，原位傅立叶变换红外光谱和程序升温脱附表明，NO ₂的促进吸附取决于NO _{2之间加强的相互作用}和 Ni(II) 节点位点借助不饱和配位的 OH 基团。这项工作提供了一种通用的解决方案，可以在室温下开发有前途的基于 CN 的光电传感器。

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Improved Performance of g-C3N4 for Optoelectronic Detection of NO2 Gas by Coupling Metal–Organic Framework Nanosheets with Coordinatively Unsaturated Ni(II) Sites

Sensitive and selective optoelectronic detection of NO₂ with g-C₃N₄ (CN) is critical, but it remains challenging to achieve ultralow concentration (ppb-level) detection. Herein, Ni metal–organic frameworks/CN nanosheet heterojunctions were successfully fabricated by the electrostatic induced assembly strategy and then treated by a post-alkali etching process for creating coordinatively unsaturated Ni(II) sites. The optimized heterojunction exhibits a record detection limitation of 1 ppb for NO₂, well below that observed on pristine CN, and an outstanding selectivity over other gases, along with long-time stability (120 days) at room temperature. The resulting superior detection performance benefits from the enhanced charge transfer and separation of the closely contacted heterojunction interface and the favorable adsorption of NO₂ by unsaturated Ni(II) as selective adsorption sites mainly by means of the time-resolved photoluminescence spectra and in situ X-ray photoelectron spectra. Moreover, the in situ Fourier transform infrared spectra and temperature-programmed desorption disclose that the promotion adsorption of NO₂ depends on the strengthened interaction between NO₂ and Ni(II) node sites at the aid of OH groups from unsaturated coordination. This work offers a versatile solution to develop promising CN-based optoelectronic sensors at room temperature.

更新日期：2023-02-24

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