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In this work, we deposited nanocolumnar aluminum doped zinc oxide (AZO) film by glancing angle deposition (GLAD) to produce transparent conductive oxide (TCO) film with omnidirectional antireflection property. The crystalline structure, morphology, optical and electrical properties of nanocolumnar AZO film prepared at different sputtering powers were characterized by x-ray diffractrometry, field emission scanning electron microscope, UV-Vis-NIR spectrophometry with angle dependence technique and hall measurement, respectively. From the results, the XRD measurement revealed that the films was the nanocolumnar structure. The average transmisstance in visible region of the nanocolumnar AZO films ranged from 82-86%. Moreover, the nanocolumnar AZO film deposited at 75 W with thickness of 190 nm showed low resistivity of 5.8x10-3 Ω.cm and high optical transmittance in the incident-angle range of -80° to 80°. In addition, such nanocolumnar AZO film also promising applied as TCO with omnidirectional antireflection coating for solar cell and optoelectronic applications. [ABSTRACT FROM AUTHOR]

Surface Enhanced Raman Scattering (SERS) is a new invention developed to expand the Raman signal. The SERS chip has a performance to enhance the Raman signal up to a million times. Nevertheless, the chip has some disadvantages which are high cost and it is disposable device. In this research, the controllable decoration of gold nanoparticles on zinc oxide nanorods template for a reusable SERS chip is investigated. Time periods to decorate gold particles are controlled by using DC magnetron sputtering technique from 15 to 450 s. The zinc oxide nanostructures are grown by hydrothermal. The physical structures of the reusable SERS chip are analyzed by Field Emission Scanning Electron Microscope (FE-SEM). The sizes and thicknesses of the gold particles attached to the ZnO nanorods are measured from FE-SEM images. The efficiency to amplify Raman signal of the reusable SERS chip is tested by dropping methylene blue (MB). UV light is used to activate self-cleaning property of the reusable SERS chip. From the results, sputtering gold nanoparticles for 270 s shows the highest performance to amplify Raman signal of methylene blue, up to 1x10-6 M, however; it takes 450 minutes of UV cleaning before reuse again. On the other hand, sputtering gold nanoparticles for 15 s shows the fastest clean surface after UV cleaning, though the chip can amplify the Raman signal up to 1x10-5 M. [ABSTRACT FROM AUTHOR]

In this study, the electrochromic tungsten oxide (WO3) nanorods were successfully prepared by reactive dc magnetron sputtering with oblique angle deposition (OAD) technique on silicon (100) wafer, glass slide and ITO coated glass substrates. The influence of sputtering power on the WO3 nanorods were investigated by grazing incident X-ray diffractometer, field emission scanning electron microscope and spectrophotometer. The thickness of the WO3 nanorods layer was controlled at 400 nm by adjusting the deposition time in order to optimize the electrochromic property. These WO3 nanorods had an amorphous and high transmittance with omnidirectional antireflection property. In addition, the prepared electrochromic WO3 nanorods sample were also shown high optical contrast which demonstrated considerable potential in the smart window application. [ABSTRACT FROM AUTHOR]