TY - JOUR
T1 - In situ manipulation of E-beam irradiation-induced nanopore formation on molybdenum oxide nanowires
AU - Ting, Yi Hsin
AU - Wu, Min Ci
AU - Aoyama, Yoshitaka
AU - Lu, Kuo Chang
AU - Wu, Wen Wei
N1 - Funding Information:
W.-W.W. acknowledges the support from the Ministry of Science and Technology (MOST) in Taiwan (MOST 108-2221-E-009-036-MY3, MOST 106-2628-E-009-002-MY3 and MOST 106-2119-M-009-008). This work was financially supported by the “Center for Semiconductor Technology Research at National Chiao Tung University” and the “Frontier Research Center on Fundamental and Applied Sciences of Matters at National Tsing Hua University” from the Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan. It was also supported in part by the Ministry of Science and Technology, Taiwan, under Grant MOST-109-2634-F-009-029. Additionally, K.-C.L. acknowledges the support from the Ministry of Science and Technology of Taiwan through Grant MOST 105-2628-E-006-002-MY3 and MOST 108-2221-E-006-139-MY3.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/4/1
Y1 - 2021/4/1
N2 - The Mo5O14-type structure is representative of the MoO-based catalyst in the selective oxidation process. Single-crystalline Mo5O14 nanowires can be synthesized in a controlled manner by chemical vapor deposition (CVD). A nanowire catalyst with a porous structure combines the advantages of both nanoparticles and nanowires, leading to a substantial increase in the specific surface area. Therefore, we aim to manipulate the e-beam irradiation process on Mo5O14 nanowires to induce the nanoporous structures in selected regions. In situ transmission electron microscopy (TEM) enabled us to visualize the structural transformation through gradual e-beam irradiation. The e-beam irradiation process removes oxygen atoms and renders the internal structure unstable. After the irradiated region is exposed to air, atoms tend to escape to decrease the internal energy. This results in the formation of nanopores because of the irradiation effect. By nanoscale modification method, the irradiated region is controlled by the electron beam size, which determines the nanopore distribution in the selected region. The study is beneficial for increasing the surface area of Mo5O14-type catalysts with variable nanopore densities and for modifying nanomaterials using a convenient method.
AB - The Mo5O14-type structure is representative of the MoO-based catalyst in the selective oxidation process. Single-crystalline Mo5O14 nanowires can be synthesized in a controlled manner by chemical vapor deposition (CVD). A nanowire catalyst with a porous structure combines the advantages of both nanoparticles and nanowires, leading to a substantial increase in the specific surface area. Therefore, we aim to manipulate the e-beam irradiation process on Mo5O14 nanowires to induce the nanoporous structures in selected regions. In situ transmission electron microscopy (TEM) enabled us to visualize the structural transformation through gradual e-beam irradiation. The e-beam irradiation process removes oxygen atoms and renders the internal structure unstable. After the irradiated region is exposed to air, atoms tend to escape to decrease the internal energy. This results in the formation of nanopores because of the irradiation effect. By nanoscale modification method, the irradiated region is controlled by the electron beam size, which determines the nanopore distribution in the selected region. The study is beneficial for increasing the surface area of Mo5O14-type catalysts with variable nanopore densities and for modifying nanomaterials using a convenient method.
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U2 - 10.1016/j.apsusc.2020.148874
DO - 10.1016/j.apsusc.2020.148874
M3 - Article
AN - SCOPUS:85098968982
SN - 0169-4332
VL - 544
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 148874
ER -