Detection Technique For Vitamin D-3 Using Er-Doped Tio2 Nanowire-Based Uv Photodetector

Vitamin D-3 acts as a crucial biomarker for various diseases. Current methods for vitamin D-3 detection are time-consuming, expensive, and require trained personnel. We report a simple and cheap photodetector (PD)-based vitamin D-3 detection technique for the first time using Ag nanoparticles-covered Er-doped TiO2 nanowires. The operational stability of the device was tested under the dark as well as the UV light illumination. Vitamin D-3 solution produced absorption bands at 222 and 280 nm, respectively. The PD current density varied from 1.29 x 10(-)4 A/cm(2) to 1.74 x 10(-4) at -4 Vfor pure ethanol solution and 20 pg/ml D-3 solution, respectively (under 220 nm illumination). The average absolute current values were reduced from 3.25 nA (220 nm) and 2.9 nA (340 nm) for 5 pg/ml to 2.95 nA (220 nm) and 2.54 nA (340 nm) for 30 pg/ml D3 solution, respectively. The current gradually increased up to 3.34 nA (220 nm) and 2.7 nA (340 nm) as the concentration was increased up to 80 pg/ml. The PD current/vitamin D-3 concentration decreases exponentially from 0.58 to 0.03 nA/g/ml) for 5 and 80 pg/ml, respectively, under 220 nm excitation, from which an unknown concentration of vitamin D-3 can be obtained. (C) 2020 Society of Photo-Optical Instrumentation Engineers (SPIE).