Simultaneously Broadened Visible Light Absorption and Boosted Intersystem Crossing in Platinum-Doped Graphite Carbon Nitride for Enhanced Photosensitization,ACS Applied Materials & Interfaces

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Simultaneously Broadened Visible Light Absorption and Boosted Intersystem Crossing in Platinum-Doped Graphite Carbon Nitride for Enhanced Photosensitization
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-05-22 00:00:00 , DOI: 10.1021/acsami.9b02767
Chaobi Li _{1,

2} , Ying Wang ₃ , Chenghui Li ₃ , Shuxia Xu ₂ , Xiandeng Hou ₃ , Peng Wu _{1,

3}

Affiliation

Herein, taking graphite carbon nitride (g-C₃N₄) as the example, we demonstrated that the two limiting factors that determine the photosensitization performance, namely, light absorption and intersystem crossing (ISC), could be simultaneously enhanced through Pt²⁺ doping. Specifically, as a π-conjugated two-dimensional semiconductor, g-C₃N₄ is capable of absorbing light shorter than 460 nm (2.7 eV). Upon Pt²⁺ doping that allows metal-to-ligand charge transfer (MLCT) from Pt²⁺ to the substrate g-C₃N₄, the light absorption of g-C₃N₄ was greatly expanded up to 1000 nm. Meanwhile, the large atomic number of Pt²⁺ ensures promotion of ISC to activate the triplet state of g-C₃N₄ via heavy atom effect (HAE), which was confirmed via both photosensitization performance and photophysical characterizations. Further, the enhanced light absorption and photosensitization of Pt²⁺-doped g-C₃N₄ were harvested for antibiotics removal, a type of environment contaminants that gained global attention because of their worldwide abuse. Compared with its undoped counterpart, Pt²⁺-doped g-C₃N₄ featured significantly improved antibiotics removal in the presence of low-power white LED irradiation, which is promising for photosensitized environmental remediation.

中文翻译：

同时增强铂掺杂石墨氮化碳中可见光的吸收和促进的系统间穿越，以增强光敏性

本文以石墨碳氮化物（g -C ₃ N ₄）为例，表明通过Pt ²⁺可以同时提高决定光敏性能的两个限制因素，即光吸收和系统间交叉（ISC）。掺杂。具体地，作为π共轭二维半导体，g -C ₃ N ₄能够吸收比460nm（2.7eV）短的光。在Pt ²⁺掺杂后，允许金属到配体的电荷转移（MLCT）从Pt ²⁺到衬底g -C ₃ N ₄，光的吸收g -C ₃ N ₄大大扩展到1000 nm。同时，Pt ²⁺的大原子数确保了ISC促进重原子效应（HAE）激活g -C ₃ N ₄的三重态，这通过光敏性能和光物理特征得以证实。此外，收获了Pt ²⁺掺杂的g -C ₃ N ₄增强的光吸收和光敏性，用于去除抗生素，这是一种由于在全世界范围内的滥用而引起全球关注的环境污染物。与其对应的掺杂相比，铂²⁺掺杂g -C ₃ N ₄在低功率白色LED照射下具有显着改善的抗生素去除效果，这有望用于光敏性环境修复。

更新日期：2019-05-22

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