The naked-eye detection of NH(3) -HCl by polyaniline-infiltrated TiO(2) inverse opal photonic crystals.
The naked-eye detection of NH(3) -HCl by polyaniline-infiltrated TiO(2) inverse opal photonic crystals.
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DOI：
10.1002/marc.201100575
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发表时间：
2012-03
影响因子：
4.6
通讯作者：
Cihui Liu;Guizhi Gao;Yuqi Zhang;Libin Wang;Jingxia Wang;Yanlin Song
中科院分区：
文献类型：
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作者：
Cihui Liu;Guizhi Gao;Yuqi Zhang;Libin Wang;Jingxia Wang;Yanlin Song
聚苯胺渗透的二氧化钛反蛋白石光子晶体(PC)薄膜从酸性环境切换到碱性蒸气环境时，可以获得可逆的变色。在饱和的NH(3)环境中，样品的禁带从556 nm变化到688 nm，出现132 nm的较大位移，颜色由绿变红。放置在HCl蒸气中后，阻带发生蓝移，颜色变回绿色。这一结果归因于PANI被酸或碱掺杂或脱掺杂，PC薄膜的有效折射率也随之发生变化。通过PC膜的可逆变色，可以实现对NH(3)和HCl蒸气的肉眼检测，这对化学和生物传感器具有重要意义。
A reversible color change of a polyaniline-infiltrated TiO(2) inverse opal photonic crystal (PC) film can be obtained when the PC is switched from an acidic to alkali vapor environment. In a saturated NH(3) environment, the stopband of the as-prepared PCs changes from 556 to 688 nm; such large shift of 132 nm could be observed, corresponding to a clear color change from green to red. After placing in HCl vapor, the stopband undergoes a blue-shift and the color turns back to green. The result is ascribed to PANI being doped or dedoped by acid or base and the effective refractive index of the PC film varying accordingly. The naked-eye detection of NH(3) and HCl vapors can be realized by the reversible color change of the PC film, which is of importance for chemical and biological sensors.