• Bhimarao M. Patil

Copper(I) oxide (Cu2O) has emerged as a promising p-type semiconductor material owing to its low cost, environmental compatibility, and excellent physicochemical tunability. Recent progress in nano structuring and surface engineering has significantly enhanced its potential for gas-sensing applications. This review comprehensively summarizes the synthesis, structural characterization, and gas-sensing performance of Cu2O based nanomaterials. Various synthesis methods including thermal oxidation, hydrothermal, solvothermal, and chemical vapor deposition are analyzed in terms of morphological control and crystallinity. Characterization techniques such as XRD, SEM, TEM, XPS, Raman, and UV–Vis spectroscopy are discussed for evaluating structure property relationships. Special emphasis is placed on the role of particle size, morphology, doping, and heterojunction formation on sensing performance toward NO2, CH4, H2S, and ethanol vapours. Mechanistic aspects of surface adsorption, oxygen vacancy dynamics, and charge transfer are highlighted. The review concludes with current challenges and future directions for the rational design of Cu2O nanostructures for next-generation gas sensors.

Cu2O; nanomaterials; gas sensing; metal oxide semiconductors; NO2 sensor; thermal oxidation.

"SYNTHESIS, STRUCTURAL CHARACTERIZATION, AND GAS-SENSING PERFORMANCE OF CU2O BASED NANOMATERIALS: A COMPREHENSIVE REVIEW", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 4, page no.287-293, April-2018, Available :http://www.jetir.org/papers/JETIR1804505.pdf

"SYNTHESIS, STRUCTURAL CHARACTERIZATION, AND GAS-SENSING PERFORMANCE OF CU2O BASED NANOMATERIALS: A COMPREHENSIVE REVIEW", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 4, page no. pp287-293, April-2018, Available at : http://www.jetir.org/papers/JETIR1804505.pdf