Article
Chemistry, Physical
Mohammad Karimi Sahnesarayi, Saeed Rastegari, Hossein Sarpoolaky
Summary: The introduction of nanotechnology is promising for the fabrication of photoelectrodes, especially those based on two-dimensional materials. In this study, vertically aligned Bi2O3 nanosheet arrays were prepared using the Chemical Bath Deposition method. The physical and photoelectrochemical properties of the Bi2O3 nanosheet coatings were studied by varying the bath temperature and complexing agent concentration. The results showed that the bath temperature had a significant impact on the physical properties of the coatings, and the photoelectrode prepared at 60 degrees C exhibited the highest photocurrent density due to its lowest charge transfer resistance and narrowest bandgap.
SURFACES AND INTERFACES
(2022)
Article
Engineering, Electrical & Electronic
Donglai Zhong, Jingxia Liu, Mengmeng Xiao, Yunong Xie, Huiwen Shi, Lijun Liu, Chenyi Zhao, Li Ding, Lian-Mao Peng, Zhiyong Zhang
Summary: This study demonstrates the fabrication of identical PUFs (twin PUFs) on a carbon nanotube array for secure communication. Two rows of field-effect transistors fabricated perpendicular to the growth direction of carbon nanotubes randomly produce three types of transistor channels, which can be used to extract ternary bits as a shared key. The twin PUFs exhibit high uniformity, uniqueness, randomness, and reliability, with approximately 95% consistency. Furthermore, separated twin PUFs can achieve secure communication with a bit error rate of one bit per trillion via fault-tolerant design.
NATURE ELECTRONICS
(2022)
Article
Multidisciplinary Sciences
Katherine R. Jinkins, Sean M. Foradori, Vivek Saraswat, Robert M. Jacobberger, Jonathan H. Dwyer, Padma Gopalan, Arganthael Berson, Michael S. Arnold
Summary: Semiconducting carbon nanotubes collected at a liquid/liquid interface self-organize into two-dimensional nematic liquid crystals that globally align with flow and can be transferred onto substrates to generate dense arrays aligned within +/- 6 degrees. The alignment and uniformity of the transferred assemblies enable field-effect transistors with exceptional on-state current density and low variation, showing promise for commercial semiconductor electronics.
Article
Engineering, Electrical & Electronic
Yanxia Lin, Yu Cao, Sujuan Ding, Panpan Zhang, Lin Xu, Chenchen Liu, Qianlan Hu, Chuanhong Jin, Lian-Mao Peng, Zhiyong Zhang
Summary: Aligned semiconducting carbon nanotubes have the potential to be an alternative to silicon in scaled field-effect transistors (FETs) due to their easy miniaturization and high energy efficiency. Researchers have successfully fabricated aligned carbon nanotube FETs at the same dimensions as low-node silicon technology, demonstrating size and electronic performance superior to silicon transistors. By introducing a full-contact structure, nanotube FETs with scaled contacted gate pitch comparable to the 10 nm silicon technology node have been created, exhibiting higher carrier mobility and Fermi velocity.
NATURE ELECTRONICS
(2023)
Article
Chemistry, Physical
Mohammad Karimi Sahnesarayi, Hossein Sarpoolaky, Saeed Rastegari
Summary: Vertically aligned beta-Bi2O3 nanosheet arrays were deposited on FTO using a chemical bath deposition technique. The structure, morphology, and optical properties of the coatings were optimized by adjusting the bismuth ion concentrations and pH values. The optimized photoelectrode showed a high photocurrent density.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Yu Cai, Huitao Yu, Can Chen, Yiyu Feng, Mengmeng Qin, Wei Feng
Summary: Vertically aligned carbon nanotube (VACNT) arrays have superior vertical thermal conductivity but suffer from weak interaction between adjacent carbon nanotubes (CNT) during polymer infiltration. This study introduces a novel three-dimensional CNT (3DCNT) network structure, where VACNT is crosslinked by secondary CNT, to provide in-plane phonon paths and maintain structural stability. Results show that the 3DCNT20/P composite has significantly higher vertical and horizontal thermal conductivity compared to the IVACNT/P composite.
Article
Engineering, Chemical
Chaorui Xue, Ruizhi Xue, Ruirui Huang, Xiangqian Fan, Huinian Zhang, Wenjing Zheng, Ying Li, Ning Li, Qing Chang, Shengliang Hu
Summary: The performance of interfacial solar-driven water evaporation (ISDWE) technology was enhanced by anodized TiO2 nanotube film and applied voltage on Ti mesh. The water evaporation rate increased from 1.20 kg·m- 2·h-1 to 2.48 kg·m- 2·h-1. The hydrophilic and nanoporous nature of TiO2 nanotube film improved the solar absorptivity and wettability of Ti mesh, thereby reducing the water evaporation enthalpy and achieving a water evaporation rate of 1.98 kg·m- 2·h-1. The applied voltage also enhanced the salt-resistance property of Ti mesh coated with TiO2 nanotube film.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Xiaoyan Huang, Zhuoxi Liang, Jiqiu Wen, Yong Liu, Ayoub Taallah, Xin Yao, Zhiyou Zhang, Tian Yu, Sijie Zhang
Summary: By combining a hard template with a dynamic negative template, orderly aligned micrometer-length manganese nanotubes (Mn-NTs) decorated with nanopores on their walls as the secondary structure are successfully grown by electrodeposition in aqueous solution. The morphology evolution of the nanopores exhibits distinguished size distribution compared with that found in conventional nanoporous foam grown solely by the dynamic template approach, attributed to the nanoconfinement of the hard template.
Article
Chemistry, Physical
Guangjie Yuan, Zhenhua Liu, Zhipeng Cao, Jiefei Xie, Haohao Li, Long Li, Yueli Sun, Yingzhong Tian
Summary: This study utilized PECVD to prepare VACNTs on ALD ZnO films, with NH2 radicals exhibiting higher reactivity than H2 molecules and H radicals, leading to lower activation energy for the nucleation and initial growth of VACNTs.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
R. M. Silva, J. Rocha, R. F. Silva
Summary: In this study, we successfully coated vertically aligned carbon nanotube micropillars with a uniform and high surface area Fe-NH2TP hybrid coating using Atomic/Molecular Layer Deposition (ALD/MLD). The effectiveness of the coating was confirmed through various analytical techniques. The hydrophobic property of the Fe-NH2TP hybrid film was also demonstrated. These findings contribute to advancing the understanding of growing high-quality one-dimensional materials using ALD/MLD and have potential for future research in this field.
Article
Engineering, Mechanical
Mao Ni, Yan Zhou, Zeqi Hu, Xunpeng Qin, Xiaochen Xiong, Feilong Ji
Summary: A novel weaving deposition strategy was developed to achieve a stable and consistent weld bead on complex curved surfaces in wire arc additive manufacturing. The effects of process parameters on geometric dimensions and formability of the woven weld bead were systematically investigated. Experimental results showed that the optimal parameters led to a stable and consistent weld bead with improved dimensional accuracy and surface quality on curved surfaces.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Nanoscience & Nanotechnology
Yunfan Guo, Enzheng Shi, Jiadi Zhu, Pin-Chun Shen, Jiangtao Wang, Yuxuan Lin, Yunwei Mao, Shibin Deng, Baini Li, Ji-Hoon Park, Ang-Yu Lu, Shuchen Zhang, Qingqing Ji, Zhe Li, Chenguang Qiu, Song Qiu, Qingwen Li, Letian Dou, Yue Wu, Jin Zhang, Tomas Palacios, Anyuan Cao, Jing Kong
Summary: In this study, a non-destructive soft-lock drawing method was developed to assemble high-density horizontal arrays of single-walled carbon nanotubes (CNTs). The assembled CNT bundles were then used as nanometer electrical contacts in high-density monolayer molybdenum disulfide (MoS2) transistors, demonstrating their potential for future electronic devices and advanced integration technologies.
NATURE NANOTECHNOLOGY
(2022)
Article
Chemistry, Physical
Kai Zhang, Wenbin Gong, Zhuo Li, Weigao Xu, Yagang Yao
Summary: By adding a layer of patterned aluminum to the conventional catalyst, the orientation, density, and arrangement of nanotube segments in CNT forests were improved, resulting in a CNTF with densely-packed, horizontally-aligned surface nanotube segments. Nanoindentation results and coarse-grained simulations indicated that the lateral stretching of nanotube segments played a major role in the superior adhesion performance of the CNTF.
Review
Chemistry, Physical
Qingxiong Liu, Xiaofei Shi, Qinyuan Jiang, Run Li, Sheng Zhong, Rufan Zhang
Summary: The focus of the research is on improving the array lengths of VACNTs, especially for applications such as fibers. Challenges still remain in synthesizing VACNTs with lengths over centimeters using current methods.
Article
Chemistry, Physical
Xiao-Ying Zhang, Duan-Chen Peng, Jing Han, Fang-Bin Ren, Shi-Cong Jiang, Ming-Chun Tseng, Yu-Jiao Ruan, Juan Zuo, Wan-Yu Wu, Dong-Sing Wuu, Chien-Jung Huang, Shui-Yang Lien, Wen-Zhang Zhu
Summary: Aluminum nitride (AlN) thin films with considerable properties were prepared using remote plasma atomic layer deposition (RP-ALD). The properties of AlN films with different growth temperatures were studied, and the characteristics of AlN/GaN and AlN/Al2O3 interfaces were analyzed on sapphire substrates. The experimental results showed that crystal AlN films with a hexagonal wurtzite structure were obtained at 250 degrees C. X-ray photoelectron spectroscopy confirmed the presence of Al-O, Al-O-N complexes, and Al-Al metallic aluminum bonds in the AlN films. High-resolution transmission electron microscopy revealed sharp interfaces of AlN/Al2O3 and AlN/GaN. Photoluminescence measurements confirmed that the AlN buffer layer enhances the quality of GaN grown on sapphire substrates. The high-quality AlN/GaN layers prepared by RP-ALD provide a promising pathway for high-quality GaN-based devices.
SURFACES AND INTERFACES
(2023)