HOME > Profile > CRETU, Ovidiu
- TEL
- +81-29-860-4432
- Address
- 305-0044 1-1 Namiki Tsukuba Ibaraki JAPAN [Access]
Research
PublicationsNIMS affiliated publications since 2004.
Research papers
- Ovidiu Cretu, Dai-Ming Tang, Da-Bao Lu, Bo Da, Yoshihiro Nemoto, Naoyuki Kawamoto, Masanori Mitome, Zejun Ding, Koji Kimoto. Nanometer-level temperature mapping of Joule-heated carbon nanotubes by plasmon spectroscopy. Carbon. 201 (2023) 1025-1029 10.1016/j.carbon.2022.10.006
- Ovidiu Cretu, Han Zhang, Koji Kimoto. Direct Observation of Thermal Vibration Modes Using Frequency-Selective Electron Microscopy. Nano Letters. 22 [24] (2022) 10034-10039 10.1021/acs.nanolett.2c03762
- Ovidiu Cretu, Akimitsu Ishizuka, Keiichi Yanagisawa, Kazuo Ishizuka, Koji Kimoto. Atomic-Scale Electrical Field Mapping of Hexagonal Boron Nitride Defects. ACS Nano. 15 [3] (2021) 5316-5321 10.1021/acsnano.0c10849
Presentations
- CRETU Ovidiu, ISHIZUKA Akimitsu, YANAGISAWA Keiichi, ISHIZUKA Kazuo, KIMOTO Koji. Atomic-Level Electrical Field Mapping of Hexagonal Boron Nitride. 日本顕微鏡学会第７７回学術講演会 (The 77th Annual Meeting of The Japanese Society of Microscopy) http://conference.wdc-jp.com/microscopy/conf2021/index.html. 2021
- コレツ オヴィヂュ, ザン チャオ, ムーア キャサリン エリザベス, ゴルバーグ デミトリ. In-situ experiments on 1D nanoscale objects inside the TEM. MANA International Symposium 2018. 2018
- CRETU, Ovidiu, ZHANG, Chao, GOLBERG, Dmitri. Cathodoluminescence Mapping of Defect Regions in Cadmium Sulfide Nanowires. Microscopy & Microanalysis 2017. 2017
Society memberships
日本顕微鏡学会
Center for Basic Research on Materials
Novel microscopy techniques for advanced characterization
Electric field mapping, Nanoscale temperature distribution, Thermal vibration mode imaging
Overview
Our aim is to extend the range of information that can be obtained by transmission electron microscopy (TEM) by developing new analysis methods. By combining these new techniques with the already impressive capabilities of modern TEMs, we can measure material properties which are not accessible by any other methods. This furthers our understanding of the advanced materials investigated and provides feedback towards improving their performance.
Novelty and originality
• Atomic-resolution measurement of the distribution of electric fields around defects in 2-D materials
• Direct observation of the thermal vibration modes of individual nanowires
• Nanometer-scale temperature mapping of in-situ Joule-heated carbon nanotubes
Details
(a) By introducing new hardware and custom-developed software, we were able to build a multi-dimension data acquisition system which allows characterizing the electrostatic properties of materials. (b) With the addition of a high-speed data acquisition interface, we were able to acquire signals in the MHz range and thus measure the vibration properties of nanomaterials and directly observe their vibration modes. (c) By carefully measuring changes in the plasmon energy, we could determine the temperature distribution of individual carbon nanotubes, while heating them to the limit of their stability at over 2000K
Summary
The current research offers new critical information:
• About the properties of defects in 2D materials, which influence their electrical performance and damage mechanism.
• About the vibration properties of nanowires, towards their use as resonators or electron sources.
• About the thermal strength of carbon nanotubes under electrical load, as ultimate interconnects.
