http://www.iaeme.com/IJARET/index.asp 2708 editor@iaeme.com International Journal of Advanced Research in Engineering and Technology (IJARET) Volume 11, Issue 12, December 2020, pp. 2708-2716, Article ID: IJARET_11_12_255 Available online at http://www.iaeme.com/IJARET/issues.asp?JType=IJARET&VType=11&IType=12 ISSN Print: 0976-6480 and ISSN Online: 0976-6499 DOI: 10.34218/IJARET.11.12.2020.255 © IAEME Publication Scopus Indexed V 2 O 5 NANOSTRUCTURES: SYNTHESIS, CHARACTERIZATION AND AMMONIA SENSING PROPERTIES Vinutha Srikanth Associate Professor, Department of Electrical & Electronics Engineering, K.S. School of Engineering and Management, Bangalore, Karnataka, India Mahesh Shastri Research Scholar, Department of Nanotechnology, VIAT- Visvesvaraya Institute of Advanced Technology, VTU- Visvesvaraya Technological University, PG Centre, Karnataka, India Dr. Santosh R Desai Professor, Department of Electronics and Instrumentation Engineering, B.M.S. College of Engineering, Bangalore, Karnataka, India Dr. Cyril Prasannaraj Professor and Dean (R & D), MS Engineering College, Bangalore, Karnataka, India Dr. Dinesh Rangappa* Professor and Chairman, Department of Nanotechnology, VIAT- Visvesvaraya Institute of Advanced Technology, VTU- Visvesvaraya Technological University, PG Centre, Karnataka, India *Corresponding Author ABSTRACT Vanadium pentoxide nanostructures were investigated for monitoring ammonia gas at very low concentrations of about 1-2ppm. Simple hydrothermal process was applied for the synthesis of vanadium pentoxide/oxalic acid, vanadium pentoxide/GO, vanadium pentoxide/formic acid, vanadium pentoxide/TiO 2 nanostructures. Also these nanostructures were compared with that of commercially available vanadium pentoxide nanostructures. These samples were studied for their morphological, microstructural properties by XRD, SEM, UV-visible investigations. Application of the synthesized nanostructures of vanadium pentoxide with different dopants in highly sensitive ammonia resistive sensors has been demonstrated. Key words: Hydrothermal, sensor , morphology , ammonia gas, vanadium pentoxide.