This book provides a comprehensive overview of the current state-of-art in oxide nanostructures, carbon nanostructures and 2D materials fabrication. It covers mimicking of sensing mechanisms and applications in gas sensors. It focuses on gas sensors based on functional nanostructured materials, especially related to issues of sensitivity, selectivity, and temperature dependency for sensors. It covers synthesis, properties, and current gas sensing tools and discusses the necessity for miniaturized sensors. This book will be of use to senior undergraduate and graduate students, professionals, and researchers in the field of solid-state physics, materials science, surface science and chemical engineering.

Sabu Thomas is currently Professor and Pro-Vice Chancellor at Mahatma Gandhi University, Kerala, India, in addition to being the founder director of the International and Inter University Centre for Nanoscience and Nanotechnology. After his B.Tech. in Polymer Science and Rubber Technology from the University of Cochin, he pursued his Ph.D. from Indian Institute of Technology, Kharagpur. Prof. Thomas has received many national and international awards, including Fellowship of the Royal Society of Chemistry, MRSI award, SESR award, Dr. APJ Abdul Kalam Award for Scientific Excellence, an honorary degree by Université de Lorraine, and multiple fellowships by prestigious societies and universities. Prof. Thomas' research has spanned many areas of nanocomposite and polymer science and engineering, and he has edited more than 70 books, holds 5 patents and has authored over 750 research publications. 

Niravkumar Joshi is currently a FAPESP postdoctoral fellow at the University of Sao Paulo, Brazil. He completed his M.S. and Ph.D. in Applied Physics at Maharaja Sayajirao University of Baroda, after which he joined as a Research Associate at Bhabha Atomic Research Centre, India with joint collaboration with Paris University, France. He has postdoctoral experience from South Korea, Brazil and United States, having most recently completed his tenure at University of California Berkeley, USA where he developed selective and sensitive microsensor by MEMS techniques. His present research focuses on synthesis and characterization of oxide nanostructures and 2D material-based gas sensors. He has authored more than 20 international research papers and 3 book chapters. 

Vijay Kumar is currently working as Fulbright-Nehru Postdoctoral fellow in Berkeley Sensor & Actuator Center, University of California, Berkeley, USA, where he is exploring the insights of ordered mesoporous hybrid materials for novel humidity/gas sensingapplications. He received his Ph.D. in Materials Science and Nanotechnology from D.C.R. University of Science & Technology, India, after which he worked with the Institute of Nano Science & Technology, Punjab, India and the University of Kiel, Germany. Dr. Kumar has authored more than 50 international research papers and 11 book chapters. 

¿Section A: Oxides/nitrides based Sensors.- Chapter 1- Hierarchical Oxide Nanostructures based gas sensor: Recent advances.- Chapter 2- Metal Oxide heterostructures based gas sensor.- Chapter 3- UV-enhanced Oxide Nanostructures based Gas Sensors.- Chapter 4- Nitride (carbon, zinc, tin) -Metal Oxide Nanocomposites based gas sensors.- Chapter 5- Mesoporous Silica (SiO2) based gas/ humidity sensors.- Section B: Graphene based sensors.- Chapter 6- Graphene Oxide (GO) Nanocomposite based room temperature gas sensor.- Chapter 7- Reduced graphene oxide (rGO) nanohybrids based gas sensors.- Chapter 8- GO/rGO based humidity sensors.- Chapter 9- Functionalized Graphene based Gas Sensors.- Chapter 10- Graphene-polymer Modified Gas Sensors.- Chapter 11- Graphene based FET sensors.- Chapter 12- Graphene-metal-organic frame work Modified Gas Sensor.- Section C: Carbon based gas sensors.- Chapter 13- Carbon nanotube based wearable room temperature gas sensor.- Chapter 14- Gold-coated Carbon nanostructured for gas sensors.- Chapter 15- Recent advances in functionalized micro and mesoporous carbon nanostructures for humidity sensors.- Chapter 16- Mesoporous carbon-dispersed metal nanoparticles-based gas sensors.- Chapter 17- Organic framework (COF, MOF, ZIF) based gas sensors.- Section D:  2-D Materials based gas sensors.- Chapter 18- Recent advances on 2D Transition Metal Dichalcogenides (TMDs) for gas sensing applications.- Chapter 19- 2D Heterostructures based gas sensors.- Chapter 20- Humidity sensing properties of MoS2 metal oxide nanocomposites.- Chapter 21- 2D metal carbide MXenes based gas sensors.- Chapter 22-  Chemical-vapor-deposition grown graphene-WS2 heterojunction-based FET sensors.- Chapter 23- 2D Materials based volatile organic compound (VOC) sensors: Prospects and challenges.- Section E: Other gas sensors.- Chapter 24: Conducting polymer/ polymer nanocomposite/ porous polymer based Gas sensors.- Chapter 25- Self-powered/ wearable/hand held/flexible sensors.