Fig. 5From: A dual-functional flexible sensor based on defects-free Co-doped ZnO nanorods decorated with CoO clusters towards pH and glucose monitoring of fruit juices and human fluidsa I–V curves for pH sensing performances and (inset in a) variation in response voltage of the 5% CO/CZO heterostructure–based electrode. b Variation in sensitivity of bare ZnO nanorods and the 3%, 5%, 7%, and 9% CO/CZO heterostructure. c Variation in response time of the 5% CO/CZO heterostructure–based device and its corresponding sensitivity determined by the d calibration plot. e Variation in sensitivity of the bare ZnO-based device and the 5% CO/CZO heterostructure–based device after immersion for 25 min in solutions of different pH values to demonstrate their chemical stability. f Variation in sensitivity and linearity of the 5% CO/CZO heterostructure–based device, when it was deformed mechanically as a sketch in inset-(ii), while inset (i) shows stress–strain plot of bare PET, ZnO/PET, Co-doped ZnO/PET, and CO/CZO heterostructure/PET-based samplesBack to article page