Article
Radiology, Nuclear Medicine & Medical Imaging
Aunnasha Sengupta, Andreu Badal, Andrey Makeev, Aldo Badano
Summary: The purpose of this work is to develop generic physics models for commercially available digital mammography and breast tomosynthesis systems. By combining Monte Carlo simulations and analytical equations, we successfully simulated three FDA-approved systems and compared the simulated image quality metrics with measured data, finding reasonable agreement.
Article
Materials Science, Ceramics
Wen Zhang, Hui Sun, Zheng Tang, Cheng Wang, Huaipu Zhu, Qianfa Su, Tixian Zeng, Dingyu Yang, Xinghua Zhu, Shibin Zhou
Summary: An amorphous state ensures the uniformity of material and device, benefiting large-area electronic devices and X-ray detectors. The PbO-Ga2O3 system materials with high atomic number have high X-ray absorption coefficients and low dark current, making them potential candidates for X-ray detector development.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Mingxi Chen, Lingjie Sun, Xiangyu Ou, Huanghao Yang, Xiaogang Liu, Huanli Dong, Wenping Hu, Xiangfeng Duan
Summary: Organic crystals show promising performance in low-dose X-ray imaging, with high resolution, sensitivity, and environmental stability.
ADVANCED MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Ruixin Sheng, Zhinan An, Andew C. -P. Chuang, Xie Xie, Peter K. Liaw, Yang Tonga
Summary: The viscoelasticity-induced structural change in Zr55Cu30Ni5Al10 metallic glass and amorphous selenium was investigated using synchrotron X-ray diffraction. Two types of structural anisotropy, characterized by residual elastic strain or heterogeneous intensity of diffraction rings, were observed by analyzing the two-dimensional diffraction pattern. The origin of the structural anisotropy is attributed to topological rearrangement in the metallic glass and conformation rearrangement in the amorphous selenium. These findings provide a structural identity to the phenomenological structureless deformation defect widely observed in different amorphous materials.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Qisheng Sun, Xinlong Yan, Siqi Chen, Jiangyan Yuan, Jing Li, Qingqing Luo, Ting Jiang, Zengqiang Gao, Hongyun Wang, Mingjian Yuan, Deyang Ji, Fan Yang, Xiaochen Ren, Xiaotao Zhang, Wenping Hu
Summary: Recently developed high-mobility 2,6-diphenylanthracene (2,6-DPA) facilitates the growth and fabrication of high-performance direct X-ray detectors (DXDs). Compared to traditional organic semiconducting crystals, 2,6-DPA exhibits low dark current density and large photoconductive gain, resulting in a record-breaking limit-of-detection and high sensitivity. 2,6-DPA is an ideal active material for DXDs and has potential for further optoelectronic applications.
Article
Engineering, Electrical & Electronic
R. R. Karthieka, T. Prakash
Summary: Low-dose X-ray sensors play a crucial role in healthcare applications, but their sensitivity is limited by the crystallite morphology of the attenuating materials. This study uses bismuth oxide (Bi2O3) to investigate the effect of grain size on direct conversion X-ray induced photocurrent at low doses. The sensitivity of nanocrystalline Bi2O3 is found to be superior to bulk-Bi2O3 due to the multiple scattering process, as discussed in detail.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Ya-Ping Deng, Yi Jiang, Ruilin Liang, Ning Chen, Weiwei Chen, Zu-Wei Yin, Graham King, Dong Su, Xin Wang, Zhongwei Chen
Summary: This article investigates the impact of anionic contribution on the dynamic reconstruction and battery behavior of 3d-metal selenides in rechargeable Zn-air batteries. Through theoretical modeling, experimental techniques, and advanced electron microscopy, the study reveals that anionic chemistry plays a positive role in enhancing the battery performance, and proposes the concept of Se back-feeding to explain this phenomenon.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Engineering, Environmental
Mei-Juan Xie, Jian Lu, Bao-Yi Li, Wen-Fei Wang, Shuai-Hua Wang, Fa-Kun Zheng, Guo-Cong Guo
Summary: High-performance and low-cost X-ray detectors are essential for medical imaging, nondestructive industrial detection, and security checks. Semiconductive coordination polymers (CPs) have recently emerged as promising materials in direct X-ray detection due to their designable structures, tunable properties, and high cost-effectiveness. However, most CPs exhibit relatively insufficient exciton dissociation, resulting in low photocurrent output and detection sensitivity, due to the strong Coulomb interactions between photogenerated electrons and holes.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Weijun Li, Lulu Liu, Mingrui Tan, Yuhong He, Chunjie Guo, Huimao Zhang, Haotong Wei, Bai Yang
Summary: A low-cost and large-area flat X-ray detector is developed by combining a cesium silver bismuth bromide perovskite semiconductor with an ethylenebis-triphenylphosphonium manganese (II) bromide scintillator. This hybrid detector displays high sensitivity and a significantly lower detection limit compared to traditional scintillators, providing a new path for X-ray flat-panel design.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Le Cheng, Tinghao Ma, Binghao Zhang, Libei Huang, Weihua Guo, Feijun Hu, He Zhu, Zhaoyu Wang, Tingting Zheng, Deng-Tao Yang, Chi-Kit Siu, Qi Liu, Yang Ren, Chuan Xia, Ben Zhong Tang, Ruquan Ye
Summary: This study reports a method for synthesizing amorphous graphene as a metal-free catalyst, which shows excellent performance in the direct nitrate-to-ammonia conversion. Atomic-resolution imaging reveals the intermediate crystalline structure in amorphous graphene and suggests that its performance is associated with the degree of amorphization.
Article
Chemistry, Multidisciplinary
Kohei Yoshimatsu, Hiroshi Kumigashira
Summary: High-quality metastable lambda-phase trititanium pentoxide (λ-Ti3O5) films were grown at very high temperatures via pulsed-laser deposition, directly on the substrate surface without transient layers. The monoclinic lambda-Ti3O5 films obtained were nearly single-domain with less than 1% rotational domains on pseudocubic LaAlO3 substrates. The successful synthesis of these films enables the utilization of their rich functionalities.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Analytical
Tristen Thibault, Oleksandr Grynko, Emma Pineau, Alla Reznik
Summary: This study discusses the reduction of dark current in X-ray photoconductors and proposes a theoretical model to describe the electric field-dependent behavior of dark current. The results show that controlling charge injection and reducing the accumulation of trapped holes are crucial in minimizing steady-state dark current. Additionally, the study demonstrates the impact of electric field redistribution on charge collection efficiency and temporal performance.
Article
Chemistry, Multidisciplinary
Kohei Yoshimatsu, Hiroshi Kumigashira
Summary: High-quality metastable lambda-phase trititanium pentoxide films were successfully grown on substrates via pulsed-laser deposition at very high growth temperature. These films directly formed on substrates without any detectable transient layers, containing almost single domains with very low fraction of rotational domains. The successful synthesis of these metastable films enables the utilization of their rich functionalities.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Engineering, Electrical & Electronic
Kaitlin Hellier, Akyl Swaby, Jennifer Ott, Shiva Abbaszadeh
Summary: Polyimide (PI) is used as a hole-blocking layer in high-resistivity photoconductors and can effectively suppress dark current. Accurate voltage drop measurement in the photoconductor is crucial for performance evaluation. In this study, we determined the voltage drop across a-Se interfaced with a thin layer of PI and characterized its temporal resolution, dynamic range, and quantum efficiency. The photoresponse of the detector was characterized using light-emitting diodes. We found that the voltage drop across a-Se is 91% of the total applied voltage, resulting in a QE near unity at 405 nm with specific electric fields.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Peng Ran, Lurong Yang, Tingming Jiang, Xuehui Xu, Juan Hui, Yirong Su, Cuifang Kuang, Xu Liu, Yang (Michael) Yang
Summary: Conventional X-ray imaging lacks spectral information and is not easily applied in large-area flat-panel X-ray imaging (FPXI). By designing multilayer stacked scintillators, multispectral X-ray imaging can be achieved, providing a facile and effective strategy for large-area FPXI.
ADVANCED MATERIALS
(2022)
