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Gas sensors based on Pd-decorated and Sb-doped SnO2 for hydrogen detection
Xingtai Chen,Tao Liu,Ran Wu,Jingkun Yu,Xitao Yin 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-
Pd-modified Sb-doped SnO2 nanomaterials were prepared by a simple hydrothermal reaction and reductionmethod. The as-obtained samples were characterized by X-ray diffraction, scanning electron microscopy,X-ray phosphorescence, and elemental mapping analysis. The extracted results demonstrated evendoping of Sb within the SnO2 lattice, and Pd was successfully incorporated on the surface of samples. Compared with the pristine SnO2, 3 mol% Sb doping with 7 wt% Pd decorating exhibited the highestresponse of 9.7 to 100 ppm H2 at 320 C and revealed excellent selectivity and cycling stability to hydrogen. The mechanism of the enhanced sensing performance of Pd@Sb-SnO2 can be attributed to the changein the energy band structure by Sb doping, the energy-band bending, and depletion layer generated withthe Pd loading. The increased oxygen vacancy caused by the lattice distortion generated by the Sb doping,and the strong metal-support interaction effect between the Pd and SnO2 also plays an important role.
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).
Defects evolution and element segregation of Ni-Mo-Cr alloy irradiated by 30 keV Ar ions
Liu Min,Liu Wenguan,He Xiujie,Gao Yantao,Liu Renduo,Zhou Xingtai 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.8
In present study, TEM foils of Ni-Mo-Cr alloy were directly irradiated with 30 keV Ar ions to allow direct characterization. The defects evolution and element segregation after irradiation were investigated by TEM and HAADF-EDS linear scanning. At low irradiation doses (1.38 and 2.76 dpa), black dots were formed and grew with increasing dose. Complicated defects including peas-shaped dislocation loops, polygon dislocation networks and large loops were visible in samples irradiated to high doses (13.8 and 27.6 dpa). Meanwhile, dislocation channels appeared, in which defects were swept out. Significant Mo depletions at dislocation lines and grain boundaries were induced by irradiation due to large misfits between Mo-Ni atoms and high content of Mo.