Fig. 4From: Manipulating the Temperature of Sulfurization to Synthesize α-NiS Nanosphere Film for Long-Term Preservation of Non-enzymatic Glucose SensorsUV/Visible/NIR absorption spectra and (αhν)2 versus hν plot in the insets of figures for synthesizing α-NiS films at a 300, b 400, and c 500 °C. d Fluorescence spectra of the α-NiS films were fabricated at different annealing temperatures (300, 400, and 500 °C for 4 h)Back to article page