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- 저자 : Burhanuddin Yeop Majlis (검색결과 2 건)
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AMORPHIZATION OF ZnO NANOWIRES BY PROTON BEAM IRRADIATION
CHANG FU DEE,ISHAQ AHMAD,LONG YAN,XINGTAI ZHOU,BURHANUDDIN YEOP MAJLIS 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.3
We report the effects of 70 keV proton (H+) irradiation on the structure of zinc oxide nanowires (ZnO NWs) for a wide range of irradiation doses at room temperature. It was found that at low dose 5 × 1015 ions/cm2 of protons, few defects were created in ZnO NWs and the defects' density was increased with an increasing proton irradiation dose. After the irradiation dose was increased to 2 × 1017 ions/cm2, the crystal structure of the ZnO NWs was almost completely damaged and the crystalline wurtzite structure of the ZnO NWs could be transformed into a disordered amorphous structure. Structural changes in the ZnO NWs upon bombardment with 70 keV protons were characterized by high resolution transmission electron microscopy (HRTEM).
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Sezawa Guided Mode on Periodic Grooves of GaN/sapphire substrate
Muhammad Musoddiq Jaafar,M. F. Mohd Razip Wee,Chang Fu Dee,Edward Yi Chang,Burhanuddin Yeop Majlis 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.4
Gallium nitride could exhibit strong piezoelectric properties which could be further developed for high frequency devices,telecommunication applications, and many more. In this study, we explored theoretically and experimentally the potentialSezawa guided mode in the groove structure along the GaN/Sapphire interface. Computational analysis with Finite ElementMethod demonstrates the presence three peaks of particular modes at specifics resonance frequencies and interestingly withhigh energy confinement inside the GaN. The experimental data of insertion loss peak graph extrapolated from s-parametermeasurement showed that the results of frequency response are correspond to three peaks of the particular modes hencevalidate the computational results. This finding is attributed to the locally resonant mechanism that confines the energy in theperiodic structure that prevents radiation of energy. This particular propagation can be exploited to enable the developmentof Sezawa-GaN platform to be operational in the liquid medium, for sensor and actuator applications.
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