Instant one step synthesis of crystalline nano V_2O_5 by solution combustion method showing enhanced negative temperature coefficient of resistance

摘要

A single phase of orthorhombic nano-vanadium pentoxide (V_2O_5) is produced using a one pot synthesis method of solution combustion process. The yellow-orange colored powder of V_2O_5 is obtained instantaneously by this method and has elliptical to spherical like morphology of its platelets. A majority of these particles are in the size range of less than 200 nm. As revealed by SAED this simple method of synthesis yields a highly crystalline product with monocrystalline and polycrystalline particles of V_2O_5 existing in the same matrix. The product shows a negative temperature coefficient of resistance (TCR) value of -3.2%℃~(-1) and a low hysteresis effect with temperature width of 5℃ in response to temperature variations. Such characteristics demonstrate that preparation of V_2O_5 by this facile method renders it a promising candidate for bolometric applications.