Figure 3 | Demonstration of chemical/bio-sensing. (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure 3 | Demonstration of chemical/bio-sensing.

Caption

a) Scheme of applying the bandgap-gradient device in chemical/bio-sensors, in which the chemical/bio-analytes (e.g., proton concentrations in solutions) result in colour changes of stimuli-responsive materials (e.g., pH testing papers), and the device senses the stimuli with colour comparisons. Measurements of the colour responses to pH testing papers in solutions with different proton concentrations (i.e., pH values of 1, 3, 5, 7, and 9) with b) a silicon photodiode, c) a spectrometer and d) the bandgap-gradient device.

Credit

by Mei-Na Zhang, Xiaohan Wu, Antoine Riaud, Xiao-Lin Wang, Fengxian Xie, Wen-Jun Liu, Yongfeng Mei, David Wei Zhang and Shi-Jin Ding

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