Nano zno nzno composed of different forms of nanostructures ie nanoparticles nanorods nanowires nanobelts nanosheets and nanoflowers has gained significant attention from researchers for the fabrication of sensors 123 medical devices 4567 composites 891011 and photocatalysts 121314 for various applications 15161718 nzno is a fascinating material that . Metal oxide semiconductor gas sensors are utilized in a variety of different roles and industries they are relatively inexpensive compared to other sensing technologies robust lightwt long lasting and benefit from high material sensitivity and quick response times they have been used extensively to measure and monitor trace amts of environmentally important gases such as carbon monoxide . Cuo is a multifunctional metal oxide excellent for chemiresistive gas sensors in this work we report cuo based no2 sensors fabricated via chemical vapor deposition cvd cvd allows great control on composition stoichiometry impurity roughness and grain size of films this endows sensors with high selectivity responsivity sensitivity and repeatability low hysteresis and quick . Particularly because the holographic gas sensors operate without any additional complex mechanical and electronic devices it will enable low cost mass producible with complementary metal oxide semiconductor fabrication techniques wearable gas sensors for factories construction and cleaning workers furthermore the device can be operated in reflective mode which may use ambient light
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