College of Materials Science and Engineering, Co-Innovation Centre of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
College of Materials Science and Engineering, Co-Innovation Centre of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
Int J Biol Macromol. 2024 Jul;273(Pt 2):132706. doi: 10.1016/j.ijbiomac.2024.132706. Epub 2024 May 31.
Benzene, as a common volatile organic compound, represents serious risk to human health and environment even at low level concentration. There is an urgent concern on visualized, sensitive and real time detection of benzene gases. Herein, by doping Fe and graphene quantum dots (GQDs), a cellulose nanocrystal (CNC) chiral nematic film was designed with dual response of photonic colors and fluorescence to benzene gas. The chiral nematic CNC/Fe/GQDs film could respond to benzene gas changes by reversible motion. Moreover, chiral nematic film also displays reversible responsive to humidity changes. The resulting CNC/Fe/GQDs chiral nematic film showed excellent response performance at benzene gas concentrations of 0-250 mg/m. The maximal reflection wavelength film red shifted from 576 to 625 nm. Furthermore, structural color of CNC/Fe/GQDs chiral nematic film change at 44 %, 54 %, 76 %, 87 %, and 99 % relative humidity. Interestingly, due to the stability of GQDs to water molecules, CNC/Fe/GQDs chiral nematic film exhibit fluorescence response to benzene gas even in high humidity (RH = 99 %) environment. Besides, we further developed a smartphone-based response network system for quantitively determinization and signal transformation. This work provides a promising routine to realize a new benzene gas response regime and promotes the development of real-time benzene gas detection.
苯作为一种常见的挥发性有机化合物，即使在低浓度下也会对人类健康和环境造成严重威胁。因此，对于苯气体的可视化、灵敏和实时检测非常重要。本文通过掺杂 Fe 和石墨烯量子点（GQDs），设计了一种纤维素纳米晶体（CNC）手性向列膜，对苯气体具有光致变色和荧光双响应。手性向列 CNC/Fe/GQDs 膜可以通过可逆运动对手性向列膜对苯气体变化作出响应。此外，手性向列膜对湿度变化也具有可逆响应。所制备的 CNC/Fe/GQDs 手性向列膜在 0-250mg/m 的苯气体浓度范围内表现出优异的响应性能。最大反射波长从 576nm 红移到 625nm。此外，在相对湿度为 44%、54%、76%、87%和 99%时，CNC/Fe/GQDs 手性向列膜的结构颜色发生变化。有趣的是，由于 GQDs 对水分子的稳定性，即使在高湿度（RH=99%）环境下，CNC/Fe/GQDs 手性向列膜也能对苯气体表现出荧光响应。此外，我们进一步开发了一种基于智能手机的响应网络系统，用于定量测定和信号转换。这项工作为实现新的苯气体响应模式提供了一种有前途的方法，推动了实时苯气体检测的发展。
