Color changes and spectral patterns. (a) The sequence of concentration-dependent changes in color of TiO2-DZ nanosensor after the detection of Bi(III) ions at different concentrations. (b) Spectral patterns obtained with DZ in the absence (blank) and in the presence of 0.5 ppm Bi(III) ions after 1-min reaction time at pH 4.
Faisal et al. Nanoscale Research Letters 2014 9:62 doi:10.1186/1556-276X-9-62