Near-Infrared Promoted Wettability Recovery of Superhydrophilic ZnO

Near-Infrared Promoted Wettability Recovery of Superhydrophilic ZnO
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近红外促进超亲水氧化锌的润湿性恢复

DOI:
10.1021/acs.jpcc.7b01672
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发表时间:
2017-06
影响因子:
3.7
通讯作者:
Duo Liu
Duo Liu
中科院分区:
化学3区
文献类型:
--
作者:
Dongfang Zhao;Ran Jia;Naikun Gao;Weishan Yan;Ling Zhang;Xi Li;Duo Liu

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超亲水和超疏水表面在自清洁、防雾、防冰、电润湿和光催化等方面具有广泛的工业应用前景。具有可逆润湿行为的表面可以通过外场来控制,这在科学和技术上都具有重要意义。光是许多自然过程的主要外部触发因素。我们在这里报告了一项基于交替紫外线和近红外(NIR)照射的智能远程技术,该技术能够动态调整氧化锌晶片的润湿性。值得注意的是,中等功率密度为500±5 mW/cm2的近红外辐射能在2 h内将图案化氧化锌从紫外光诱导的超亲水态(~lt;5°)迅速恢复到原态(125±3°)。我们发现,在UV和NIR照射下,O1s和Zn2p电子的化学环境分别发生了来回移动。NIR促进的润湿性恢复是由于选择性地激活了羟基(OH)的振动泛音跃迁。
Superhydrophilic and superhydrophobic surfaces exhibit numerous industrial applications such as self-cleaning, antifogging, anti-icing, electrowetting, and photocatalysis. A surface with reversible wetting behaviors that can be controlled by external field is both scientifically and technologically of importance. Light is a major external trigger for many natural processes. We report here an intelligent remote technology based on alternative UV and near-infrared (NIR) irradiation that enables dynamical wettability tuning of ZnO wafers. Notably, NIR irradiation with a moderate power density of 500 ± 5 mW/cm2 can rapidly recover patterned ZnO from the UV-induced superhydrophilic state (<5°) to the original state (125 ± 3°) in just 2 h. We discover that the chemical environments of O 1s and Zn 2p electrons exhibit a back-and-forth shift upon UV and NIR irradiation, respectively. The NIR-promoted wettability recovery is attributed to selective actuation of vibrational overtone transitions of hydroxyl (OH) ban...
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