Materials Engineering / Analytical Chemistry / Scanning Electron Microscopy / Compositional Analysis / Sol Gel Process / Thin Film / Absorption spectroscopy / Composite Material / Optical band gap / Energy Dispersive X-Ray Analysis / Relative Humidity / Humidity Sensor / Crystallite Size / X ray diffraction / Thin Film / Absorption spectroscopy / Composite Material / Optical band gap / Energy Dispersive X-Ray Analysis / Relative Humidity / Humidity Sensor / Crystallite Size / X ray diffraction