Article
Materials Science, Multidisciplinary
Yang Zhang, Hongyu Fan, Chunjie Niu, Yunqiu Cui, Weiyuan Ni, Weifeng Liu, Gunther Benstetter, Guangjiu Lei, Dongping Liu
Summary: The study observed the microscopic surface evolution of W crystals under low-energy He+ irradiations at 1050 K using scanning electron microscopy and atomic force microscopy. It was found that the He+ irradiation caused nanoscale undulations on the W (110) surface, with regions of less undulations dominating the microevolution of W crystals. Analysis indicated that the thermodynamic instability of irradiated W crystals was attributed to He nanobubble-driven surface growth.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Chemistry, Physical
Irem Demir, Ines Luechtefeld, Claude Lemen, Etienne Dague, Pascal Guiraud, Tomaso Zambelli, Cecile Formosa-Dague
Summary: Studying the interactions between bubbles and bio-surfaces is a challenge, but a new method can be used to understand and engineer bubble-(bio)surfaces interactions.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Jonas Weber, Yue Yuan, Fabian Kuehnel, Christoph Metzke, Josef Schaetz, Werner Frammelsberger, Guenther Benstetter, Mario Lanza
Summary: Conductive atomic force microscopy (CAFM) is a powerful technique for studying electrical and mechanical properties at the nanoscale. The reliability of probe tips is a major challenge in CAFM, and solid Pt probes offer a more durable and reliable alternative to metal-coated silicon tips. The use of solid Pt probes can enhance the reliability of CAFM experiments by providing similar performance in terms of lateral resolution and a longer lifetime.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Xiaoli Huang, Haojie Lai, Junjie Liu, Qiulan Chen, Weiguang Xie
Summary: The contact characteristic and intrinsic conductivity of single MoO2 nanosheet grown by CVD method were investigated. It was found that the contact of Ag with MoO2 was better than that of Au. The measured intrinsic conductivity of MoO2 at low bias condition is as high as (2.5 +/- 1.3) x 104 S/cm. Non-linear behavior in IV characteristic and breakdown behavior were observed with increasing bias due to the contact effect. The supported current density is around 107 A/cm2, indicating that MoO2 is a superior conductive transition metal oxide material for low-voltage applications.
Article
Physics, Applied
L. Richarz, J. He, U. Ludacka, E. Bourret, Z. Yan, A. T. J. van Helvoort, D. Meier
Summary: In this study, moire fringes observed in conductive atomic force microscopy (cAFM) scans obtained on the ferroelectric material Er(Mn,Ti)O-3 were investigated. It was found that these fringes are a result of scanning moire effect, arising from the superposition of raster scanning and sample-intrinsic properties. The findings are important for studying local transport phenomena in moire engineered materials by cAFM and provide a general guideline for distinguishing extrinsic from intrinsic moire effects.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Environmental
Irem Demir-Yilmaz, Malak Souad Ftouhi, Stephane Balayssac, Pascal Guiraud, Christophe Coudret, Cecile Formosa-Dague
Summary: Microalgae can be efficiently harvested for biofuel production using functionalized bubbles. The bubbles are coated with a bio-sourced polymer, chitosan, which enhances their adhesion to microalgae cells. The separation efficiency of functionalized bubbles is consistent with atomic force microscopy (AFM) data, achieving a microalgae separation efficiency of approximately 60% in a single step.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Saima A. Sumaiya, Jun Liu, Mehmet Z. Baykara
Summary: The atomic-scale structure and properties of material surfaces play a significant role in various chemical and mechanical phenomena. However, current methods for characterizing surfaces at the atomic level are limited by the need for strict environmental conditions. This study presents a new approach utilizing conductive atomic force microscopy (C-AFM) to achieve atomic-resolution surface imaging under ambient conditions. The results demonstrate the capability of this method to manipulate and observe surface structure and electronics in real time, with wide-ranging applicability.
Article
Materials Science, Multidisciplinary
Janis Snikeris, Vjaceslavs Gerbreders
Summary: Metal-chalcogenide systems have various applications, and this study focused on the effects of electron beam irradiation in an Ag/AsS2 bilayer, revealing an unusual distribution of conductivity that suggests the presence of at least two competing mechanisms of Ag-ion migration. The research also found that the surface relief of the Ag/AsS2 bilayer can be modified by an electric field from the conductive atomic force microscopy probe.
Article
Nanoscience & Nanotechnology
S. Katsiaounis, N. Chourdakis, E. Michail, M. Fakis, I Polyzos, J. Parthenios, K. Papagelis
Summary: In this work, we introduce an experimental protocol to engineer nanometer scale pores in CVD graphene membranes under ambient conditions, using low power ultra-short laser pulses and overcoming the drawbacks of other perforation techniques. We visualized and quantified the nanopore network using Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM), while Raman spectroscopy is utilized to correlate the nano-perforated area with the nanotopographic imaging. Our results suggest that Raman imaging provides the identification of nanoporous area and, in combination with AFM, we provide solid evidence for the reproducibility of the method, as nanopores of a certain size distribution are formed under these experimental conditions.
Article
Microscopy
Li Zhao, Xiaowei Du, Bin Fang, Qiyuan Liu, Hui Yang, Fangzuo Li, Yaohuan Sheng, Xiangfu Zeng, Haijian Zhong, Weidong Zhao
Summary: Breast cancer, a common malignant cancer in women, remains poorly understood in terms of its pathogenesis. This study utilized Conductive Atomic Force Microscopy (CAFM) to investigate the electrical conductivity and electron transport of normal and cancer breast cells. It was found that cancer cells exhibited better electrical conductivity compared to normal cells, suggesting the potential for distinguishing cancer cells and advancing further research in this field.
Article
Materials Science, Multidisciplinary
Hanliang Zhu, Mengjun Qin, Tao Wei, Joel Davis, Mihail Ionescu
Summary: Zircaloy-4 alloy specimens were irradiated with 5 MeV He ions at different temperatures, resulting in the formation of defect clusters and He bubbles. Molecular dynamics simulations and crystallography analyses revealed that the defect clusters were composed of Zr interstitials, while the He bubbles formed through the clustering of He atoms and vacancies. These findings provide insights into the irradiation-induced microstructural changes in the alloy.
Article
Materials Science, Multidisciplinary
Lilong Pang, Pengfei Tai, Hailong Chang, Minghuan Cui, Tielong Shen, Zhiguang Wang, Kong Fang Wei, Zhiwei Ma, Sihao Huang, Chao Liu, Xing Gao, Yanbin Sheng
Summary: This study investigated the evolution of irradiation defects in Ti3AlC2 samples under Fe ions, He ions, and sequential Fe and He ions irradiation. The results showed that Fe ions irradiation led to stacking faults and twins, while sequential He ions irradiation further evolved the defects induced by Fe ions and decreased the intensity of GIXRD. The findings suggest a significant impact of sequential ion irradiation on the formation of dislocation loops and He bubbles.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Keivan Asadi, Junghoon Yeom, Hanna Cho
Summary: Investigating internal resonance (IR) mechanisms in micro/nanoresonators reveals that intermodal coupling between second and third flexural modes in asymmetric structures provides an optimal condition for strong IR, with high energy transfer to the resonated mode. This study introduces design strategies that can be easily integrated into typical micro/nanoelectromechanical systems, offering potential for paradigm-shifting applications in micro/nanosystems.
MICROSYSTEMS & NANOENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Zhangfu Chen, Anh Tuan Hoang, Woohyun Hwang, Dongjea Seo, Minhyun Cho, Young Duck Kim, Lianqiao Yang, Aloysius Soon, Jong-Hyun Ahn, Heon-Jin Choi
Summary: In this study, we report the growth of single crystalline GeS microribbons using the chemical vapor transport process. By using conductive atomic force microscopy, we demonstrate that the conductive behavior in the vertical direction is mainly affected by the Schottky barriers between GeS and both electrodes. We also find that the topographic and current heterogeneities are significantly different with and without illumination.
Article
Chemistry, Physical
Cai Shen, Yunbo Huang, Jingru Yang, Minjing Chen, Zhaoping Liu
Summary: Composite solid electrolytes (CSEs) with flexible interfaces with electrodes are considered promising for all-solid-state batteries (ASSBs). In this study, LLZO-PEO composite electrolyte with different weight ratios of LLZO is prepared, and in-situ conductive atomic force microscopy (c-AFM) is used to observe the changes in electrolyte topography and mechanical properties at different temperatures. Novel insights into the migration of ions and electrons within the electrolyte are provided, highlighting the potential for design and development of composite electrolytes for next-generation ASSBs.
ENERGY STORAGE MATERIALS
(2021)
Article
Instruments & Instrumentation
Taisei Hayashi, Kensei Ichiba, Daisuke Nakauchi, Takumi Kato, Noriaki Kawaguchi, Takayuki Yanagida
Summary: In this study, Cr-doped Mg4Ta2O9 single crystals with different doping levels were synthesized using the floating zone method, and their photoluminescence and scintillation properties were evaluated. The results showed that Cr-doped Mg4Ta2O9 single crystals exhibited broad emission bands in the near-infrared region and showed scintillation characteristics within specific wavelength ranges. Additionally, the samples with different Cr doping levels demonstrated different lower detection limits based on the dose rate response function.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)
Article
Instruments & Instrumentation
S. Marouf, A. C. Chami, Y. Boudouma
Summary: This study develops a Monte Carlo simulation approach to describe proton-induced secondary electron emission in solids. Theoretical modeling based on the Mott's elastic scattering cross-section and Lindhard's dielectric function was used to calculate the double differential cross-section (DDCS) of excited electrons and describe electron transport in the medium. The results for aluminum show the angular and energy distributions of backscattered electrons for incident protons with energy below 25 keV at normal incidence, and the total electron emission yield also agrees well with available measurements.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)
Article
Instruments & Instrumentation
Weipeng Yan, Baojun Duan, Zijian Zhu, Yan Song, Guzhou Song, Jiming Ma, Binkang Li, Yucheng Liu
Summary: This article reports on the scintillation performance of Lithium-doped 2D (PEA)2PbBr4 perovskite single crystals synthesized at room temperature. The crystals exhibit fast decay time, high light yield, and high spatial resolution, making them highly promising for medical diagnostic applications.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)
Article
Instruments & Instrumentation
S. B. Vishwakarma, S. K. Dubey, R. L. Dubey, I. Sulania, D. Kanjilal
Summary: Investigations have been conducted on the implanted SiO2 thin film after thermal annealing using various analytical techniques. The results revealed the absence of vacancy defects, variations in vibrational modes and the formation of new structures. The photoluminescence intensity of the annealed SiO2 samples was higher, with a decrease in non-radiative defect centers and an increase in radiative Si:SiO2 interface states. Additionally, the presence of silicon nanoclusters formed after annealing resulted in an additional radiative recombination peak. Furthermore, the formation of new SiOx structures was observed after thermal annealing.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)
Article
Instruments & Instrumentation
M. Koshimizu, S. Kurashima, A. Kimura, M. Taguchi
Summary: By observing the scintillation time profiles of CeF3 under irradiations of pulsed beams with different LETs, we found that the initial decay was faster for higher LET, which is consistent with previous studies on other self-activated scintillators. This faster decay at higher LET can be explained by the competition between the scintillation caused by 5d-4f transition of Ce3+ ions and quenching due to the interaction between excited Ce3+ ions close to each other.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)
Article
Instruments & Instrumentation
Junjie Shi, Jianhong Hao, Fang Zhang, Qiang Zhao, Bixi Xue, Jieqing Fan, Zhiwei Dong
Summary: This study examined the neutralization process and beam quality of a hydrogen beam by emitting negative hydrogen ions to a hydrogen target. The findings showed that the neutralization efficiency was influenced by variables such as the transport distance, energy, and target gas density. However, the maximal neutralization efficiency was not affected by the density of the target gas or the energy of the negative hydrogen ions.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)
