Vanadium Pentoxide Nanofibers as IR Sensors for Bolometer Applications

• Published in: ECS transactions 2018-01, Vol.85 (13), p.1573-1583
• Main Authors: Paul, Nirupam, Vadnala, Sudharshan, Panigrahi, Asisa Kumar, Kumar, C. Hemanth, Agrawal, Amit, Singh, Shiv Govind
• Format: Article
• Language: English
• ISSN: 1938-5862; 1938-6737; 1938-6737; 1938-5862
• DOI: 10.1149/08513.1573ecst

The main aim of this work is to report an alternative technique of creating vanadium pentoxide (V2O5) based uncooled infrared (IR) detector, by a state-of-the-art V2O5 nanofibers, manufactured by facile and economical electrospinning process. The nanofibers were thermally and electrically characterized to determine their bolometric performance. The nanofibers show maximum voltage responsivity of (ℜv) 6987.3 V/W at 100 mA DC bias, under normal room temperature and pressure condition. Nanofibers show very good thermal response (τs) and recovery time (τr) when subjected to a periodic On-Off cycle of IR lamp (150W) illumination. Temperature dependent resistance measurement reveals that nanofibers are exhibiting semiconductor to metallic phase transition at 67°C with maximum TCR% -1.6%/K at the transition temperature. V2O5 nanofibers characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman Spectroscopy confirms their crystallinity and elemental composition. The optical band gap of the nanofibers is analyzed by UV-Visible spectroscopy. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) images confirms their microstructural dimensions and surface homogeneity. The entire analysis reaffirms the suitability of V2O5 nanofibers as one of the futuristic sensing material for IR imaging applications.