Section 1: Synthesis methods and strategies applied for metal oxide nanocomposites based gas and VOC sensors 1. Features of preparing metal oxide nanocomposites: General consideration 2. Synthesis of heterostructured metal oxides nanocomposites and its gas sensing properties 3. Synthesis of Metal Oxide Composite Nanofibers by Electrospinning and its Application in Gas and VOCs Sensors 4. Recent Advances in Metal Oxide Based Bi/Multi-layer Thin Film Heterostructures for Gas Sensing Applications 5. Inkjet printing of MOx-based heterostructures for gas sensing and safety applications- - recent trends, challenges and future scope 6. Improving the parameters of metal oxide gas sensors through doping 7. Metal oxide composite-based 1D nanomaterials and its gas sensing characteristics 8. 2D and 3D nanomaterials based metal oxide composites and their applications in gas sensing 9. Composite based on metal oxides and 2D metal dichalcogenides for gas sensing 10. Graphene-metal oxide hybrids and their gas sensing characteristics 11. Metal oxide-zeolite hybrid-based gas and VOCs sensors Section 2: Complex metal oxide compounds for electrical gas and VOC sensors 12. Perovskites (ABO3) and their prospects for gas sensor application 13. ABO4 and AB2O6 structured metal oxides-based gas sensors 14. Gas sensing characteristics of AB2O4 (spinel ferrites) structured metal oxides 15. Quaternary and more complex metal oxide compounds for gas sensor design Section 3: Advanced strategies for future metal oxide nanocomposites-based sensors 16. Room temperature gas and VOCs sensors based on metal oxide composites 17. Self-powered gas and humidity sensors 18. Wearable and flexible nanocomposite-based gas and vapour sensors 19. Self-healable and highly sensitive gas sensors based on metal oxide nanocomposites 20. Isolated single-atomic-site (ISAS) materials for gas and VOC detection 21. Metal oxide nanocomposites for microbial volatile organic compounds (mVOCs) Appendix: Database of critical materials applied as VOC sensors