Article
Nanoscience & Nanotechnology
Weifang Lu, Nanami Nakayama, Kazuma Ito, Sae Katsuro, Naoki Sone, Yoshiya Miyamoto, Koji Okuno, Motoaki Iwaya, Tetsuya Takeuchi, Satoshi Kamiyama, Isamu Akasaki
Summary: The morphology and crystalline quality of p-GaN shells on coaxial GaInN/GaN multiple quantum shell nanowires (NWs) were investigated, with the TMG supply and growth temperature found to be crucial parameters. High-angle annular dark-field scanning transmission electron microscopy characterization revealed no clear extended defects in the core and sidewall of the NWs, but some dislocations were observed at the interface between the serpentine MQS and the p-GaN shell near the tips.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Kwang Jae Lee, Yusuke Nakazato, Jaeyi Chun, Xinyi Wen, Chuanzhe Meng, Rohith Soman, Maliha Noshin, Srabanti Chowdhury
Summary: This study presents experimental evidence for the use of nanoporous GaN (NP GaN) as a compensation layer to prevent the diffusion of magnesium (Mg) from p-type gallium nitride (p-GaN). Additionally, the study reveals the significant impact of NP GaN on the electron concentration of AlGaN/GaN structures.
Article
Nanoscience & Nanotechnology
Sae Katsuro, Weifang Lu, Kazuma Ito, Nanami Nakayama, Naoki Sone, Koji Okuno, Motoaki Iwaya, Tetsuya Takeuchi, Satoshi Kamiyama, Isamu Akasaki
Summary: The study explores the effects of different p-GaN shell growth conditions on the emission characteristics of MQS NW-LEDs, showing that thick p-GaN shells can influence the emission peak and light output. By utilizing a high growth rate of p-GaN shell, the current injection into both the r- and m-planes of NW structures is enhanced, leading to improved light output and EL peak intensity of NW-LEDs. Additionally, the high growth rate of p-GaN shell can suppress dislocations and defects at the apex, inhibiting current injection in nonradiative recombination centers near the c-plane.
Article
Chemistry, Multidisciplinary
Yulan Xie, Peng Wan, Mingming Jiang, Yang Liu, Daning Shi, Caixia Kan
Summary: This study presents a high-performance self-powered ultraviolet photodetector based on a single Ga-doped ZnO microwire covered by Ag nanowires and a p-type GaN wafer. The photodetector exhibits ultrafast response and high photosensitivity, with significantly improved responsivity and detectivity compared to a conventional ITO electrode. The enhanced performance is attributed to the higher optical transparency and better electrical properties of the Ag nanowires, as well as the plasmonic effect on ZnO:Ga, which enhances light absorption and photocurrent.
Article
Physics, Applied
Li Zhang, Zheyang Zheng, Song Yang, Wenjie Song, Sirui Feng, Kevin J. Chen
Summary: Reconstructing the surface of the p-GaN layer into GaON enhances the immunity to hot electron bombardment in HEMTs, improving long-term reliability. This is achieved through a high-temperature thermal process and remote oxygen plasma treatment for surface reconstruction.
APPLIED PHYSICS LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Bruno Cesar da Silva, Adam Biegannski, Christophe Durand, Zahra Sadre Momtaz, Anjali Harikumar, David Cooper, Eva Monroy, Martien Ilse den Hertog
Summary: Ultraviolet GaN photodetectors based on top-down strategies using nanowires (NWs) fabricated through nanosphere lithography and etching techniques demonstrate improved uniformity, morphology, and doping control. Measurements show a linear response of photocurrent to optical power, indicating that the dominant photodetection mechanism is the drift of photogenerated carriers at the junction, with negligible surface effects. These results demonstrate the unique properties of NW-based photodetectors that can be assessed through a scalable and low-cost fabrication process.
ACS APPLIED NANO MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Qianshu Wu, Jia Chen, Liang He, Jinwei Zhang, Qiuling Qiu, Chenliang Feng, Liuan Li, Taotao Que, Zhenxing Liu, Zhisheng Wu, Zhiyuan He, Yang Liu
Summary: This study presents a physics-based analytical model for Schotty-type p-GaN gate high-electron-mobility transistors, accurately capturing charge control properties under different conditions and validated through numerical simulations. The research shows that for certain p-GaN thicknesses, lightly doped p-GaN leads to full depletion, while p-GaN with high acceptor concentration reaches partial depletion.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Nanoscience & Nanotechnology
Omar Saket, Junkang Wang, Nuno Amador-Mendez, Martina Morassi, Arup Kunti, Fabien Bayle, Stephane Collin, Arnaud Jollivet, Andrey Babichev, Tanbir Sodhi, Jean-Christophe Harmand, Francois H. Julien, Noelle Gogneau, Maria Tchernycheva
Summary: In this study, the electrical and optical properties of single GaN nanowire p-n junctions grown by plasma-assisted molecular-beam epitaxy using magnesium and silicon as doping sources were analyzed. The results showed that parasitic radial growth enhanced by magnesium doping led to fluctuations in the junction position and shape, while reverting the doping order resulted in a more stable structure and better optical quality. Additionally, a high hole concentration in the p-doped segment was achieved without degrading the nanowire morphology.
Article
Physics, Applied
Kai Xiao, Qianqian Luo, Yi Peng, Min Li, Jia Yang, Xin Qiu, Xiaoxiao Zhang, Jianyu Deng, Wenhong Sun
Summary: Traditional surface engineering is complex and expensive for manufacturing triboelectric nanogenerator (TENG). This study presents enhanced Cu/P-type GaN TENG contacts in centimeter scale using molten KOH etching method. The generator performance has been greatly improved with increased short circuit current and open circuit voltage. The results provide insight into surface engineering for future TENG devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Ying Zhao, Shengrui Xu, Hongchang Tao, Yachao Zhang, Chunfu Zhang, Lansheng Feng, Ruoshi Peng, Xiaomeng Fan, Jinjuan Du, Jincheng Zhang, Yue Hao
Summary: The study proposed a method of combining AlGaN/GaN superlattices and Mg delta doping to achieve a high conductivity p-type GaN layer. Experimental results showed that the novel doping technique significantly improved p-conductivity and enhanced the light output power and external quantum efficiency of the fabricated green-yellow light-emitting diodes.
Article
Materials Science, Multidisciplinary
Wenxin Tang, Wenqiang Ma, Penglu Yu, Zhifang Zhou, Jinle Lan, Yuan-Hua Lin, Xiaoping Yang
Summary: In this paper, Pb-doped BiCuSeO was prepared to improve the electrical conductivity of BiCuSeO. Adding Te powder and Te nanowires further decreased the thermal conductivity, resulting in optimized thermoelectric performance.
MATERIALS TODAY PHYSICS
(2022)
Article
Chemistry, Analytical
Hanghang Lv, Yanrong Cao, Maodan Ma, Zhiheng Wang, Xinxiang Zhang, Chuan Chen, Linshan Wu, Ling Lv, Xuefeng Zheng, Yongkun Wang, Wenchao Tian, Xiaohua Ma
Summary: In this paper, the introduction of a P-type GaN buried layer into the buffer layer of AlGaN/GaN HEMTs is studied using Silvaco TCAD software. The results show that the P-type GaN buried layer greatly weakens the peak of the channel electric field, leading to a more uniform electric field distribution and a substantial reduction in lattice temperature. This mitigates the negative resistance caused by self-heating effect and enhances the breakdown performance of the device.
Article
Chemistry, Multidisciplinary
Syed M. N. Hasan, Weicheng You, Arnob Ghosh, Sharif Md. Sadaf, Shamsul Arafin
Summary: This work presents the selective area epitaxy of GaN nanostructures grown on Ga-polar GaN/sapphire substrates by plasma-assisted molecular beam epitaxy. Three types of nanostructures, namely nanowires, nanofins, and nanorings, are demonstrated on GaN-on-sapphire templates, with investigation on the control of their morphology and orientation. This study advances the understanding of selective area epitaxy for defining complex III-nitride nanostructures, which are important in the fields of nanotechnology and nanoscience.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Polymer Science
Zahra Nadizadeh, Hossein Mahdavi, Ali Akbar Heidari, Peyman Khodaei Kahriz
Summary: Pd-PTI nanocatalysts were synthesized with PTI as solid support and loaded Pd nanoparticles onto highly crystalline 2-D PTI nanosheets. Among them, PTI-1500-Pd showed the highest catalytic performance with ultra-high efficiency, stability, and excellent recovery of expensive Pd nanoparticles.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Feifei Lu, Lei Liu, Jian Tian, Xingyue Zhangyang, Hongchang Cheng, Xin Guo
Summary: A Cs-free GaN photocathode structure is reported, in which band engineering induced by Si doping eliminates the need for Cs activation, resulting in a low-barrier surface without activation.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Laetitia Bardet, Herve Roussel, Stefano Saroglia, Masoud Akbari, David Munoz-Rojas, Carmen Jimenez, Aurore Denneulin, Daniel Bellet
Summary: The thermal instability of silver nanowires leads to increased electrical resistance in AgNW networks. Understanding the relationship between structural and electrical properties of AgNW networks is crucial for their integration as transparent electrodes in flexible optoelectronics. In situ X-ray diffraction measurements were used to study the crystallographic evolution of Ag-specific Bragg peaks during thermal ramping, revealing differences in thermal and structural transitions between bare and SnO2-coated AgNW networks.
Article
Chemistry, Multidisciplinary
Nathalia Cancino-Fuentes, Arnau Manasanch, Joana Covelo, Alex Suarez-Perez, Enrique Fernandez, Stratis Matsoukis, Christoph Guger, Xavi Illa, Anton Guimera-Brunet, Maria V. Sanchez-Vives
Summary: This study provides a comprehensive characterization of graphene-based solution-gated field-effect transistors (gSGFETs) for brain recordings, highlighting their potential clinical applications.
Article
Chemistry, Multidisciplinary
Sikandar Aftab, Hailiang Liu, Dhanasekaran Vikraman, Sajjad Hussain, Jungwon Kang, Abdullah A. Al-Kahtani
Summary: This study examines the effects of hybrid nanoparticles made of NiO@rGO and NiO@CNT on the active layers of polymer solar cells and X-ray photodetectors. The findings show that these hybrid nanoparticles can enhance the charge carrier capacities and exciton dissociation properties of the active layers. Among the tested configurations, the NiO@CNT device demonstrates superior performance in converting sunlight into electricity, and achieves the best sensitivity for X-ray detection.
Article
Chemistry, Multidisciplinary
Hyo Jung Shin, Seung Gyu Choi, Fengrui Qu, Min-Hee Yi, Choong-Hyun Lee, Sang Ryong Kim, Hyeong-Geug Kim, Jaewon Beom, Yoonyoung Yi, Do Kyung Kim, Eun-Hye Joe, Hee-Jung Song, Yonghyun Kim, Dong Woon Kim
Summary: This study investigates the role of SOX9 in reactive astrocytes following ischemic brain damage using a PLGA nanoparticle plasmid delivery system. The results demonstrate that PLGA nanoparticles can reduce ischemia-induced neurological deficits and infarct volume, providing a potential opportunity for stroke treatment.
Article
Chemistry, Multidisciplinary
Anurag Chaudhury, Koushik Debnath, Nikhil R. Jana, Jaydeep K. Basu
Summary: The study investigates the interaction between nanoparticles and cell membranes, and identifies key parameters, including charge, crowding, and membrane fluidity, that determine the adsorbed concentration and unbinding transition of nanoparticles.
Article
Chemistry, Multidisciplinary
Sina Sadeghi, Fazel Bateni, Taekhoon Kim, Dae Yong Son, Jeffrey A. Bennett, Negin Orouji, Venkat S. Punati, Christine Stark, Teagan D. Cerra, Rami Awad, Fernando Delgado-Licona, Jinge Xu, Nikolai Mukhin, Hannah Dickerson, Kristofer G. Reyes, Milad Abolhasani
Summary: In this study, an autonomous approach for the development of lead-free metal halide perovskite nanocrystals is presented, which integrates a modular microfluidic platform with machine learning-assisted synthesis modeling. This approach enables rapid and optimized synthesis of copper-based lead-free nanocrystals.
Article
Chemistry, Multidisciplinary
Zahir Abbas, Nissar Hussain, Surender Kumar, Shaikh M. Mobin
Summary: The rational construction of free-standing and flexible electrodes for electrochemical energy storage devices is an emerging research focus. In this study, a redox-active metal-organic framework (MOF) was prepared on carbon nanofibers using an in situ approach, resulting in a flexible electrode with high redox-active behavior and unique properties such as high flexibility and lightweight. The prepared electrode showed excellent cyclic retention and rate capability in supercapacitor applications. Additionally, it could be used as a freestanding electrode in flexible devices at different bending angles.
Article
Chemistry, Multidisciplinary
Lishan Zhang, Xiaoting Zhang, Hui Ran, Ze Chen, Yicheng Ye, Jiamiao Jiang, Ziwei Hu, Miral Azechi, Fei Peng, Hao Tian, Zhili Xu, Yingfeng Tu
Summary: Photodynamic therapy (PDT) is a promising local treatment modality in cancer therapy, but its therapeutic efficacy is restricted by ineffective delivery of photosensitizers and tumor hypoxia. In this study, a phototactic Chlorella-based near-infrared (NIR) driven green affording-oxygen microrobot system was developed for enhanced PDT. The system exhibited desirable phototaxis and continuous oxygen generation, leading to the inhibition of tumor growth in mice. This study demonstrates the potential of using a light-driven green affording-oxygen microrobot to enhance photodynamic therapy.
Article
Chemistry, Multidisciplinary
Yujin Li, Jing Xu, Xinqi Luo, Futing Wang, Zhong Dong, Ke-Jing Huang, Chengjie Hu, Mengyi Hou, Ren Cai
Summary: In this study, hollow heterostructured materials were constructed using an innovative template-engaged method as cathodes for zinc-ion batteries. The materials exhibited fast Zn2+ transport channels, improved electrical conductivity, and controlled volume expansion during cycling. The designed structure allowed for an admirable reversible capacity and high coulombic efficiency.
Article
Chemistry, Multidisciplinary
Paritosh Mahato, Shashi Shekhar, Rahul Yadav, Saptarshi Mukherjee
Summary: This study comprehensively elucidates the role of the core and electrostatic surface of metal nanoclusters in catalytic reduction reactions. The electrostatic surface dramatically modulates the reactivity of metal nanoclusters.
Article
Chemistry, Multidisciplinary
Pei Liu, Mengdi Liang, Zhengwei Liu, Haiyu Long, Han Cheng, Jiahe Su, Zhongbiao Tan, Xuewen He, Min Sun, Xiangqian Li, Shuai He
Summary: This study demonstrates a simple and environmentally-friendly method for the synthesis of zinc oxide nanozymes (ZnO NZs) using wasted hop extract (WHE). The WHE-ZnO NZs exhibit exceptional peroxidase-like activity and serve as effective catalysts for the oxidation of 3,3,5,5-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide (H2O2). In addition, a straightforward colorimetric technique for detecting both H2O2 and glucose was developed using the WHE-ZnO NZs as peroxidase-like catalysts.
Article
Chemistry, Multidisciplinary
Hyunkyu Oh, Young Jun Lee, Eun Ji Kim, Jinseok Park, Hee-Eun Kim, Hyunsoo Lee, Hyunjoo Lee, Bumjoon J. Kim
Summary: Mesoporous carbon particles have unique structural properties that make them suitable as support materials for catalytic applications. This study investigates the impact of channel nanostructures on the catalytic activity of porous carbon particles (PCPs) by fabricating PCPs with controlled channel exposure on the carbon surface. The results show that PCPs with highly open channel nanostructures exhibit significantly higher catalytic activity compared to those with closed channel nanostructures.
Article
Chemistry, Multidisciplinary
Yunjie Lu, Zhaohui Li, Zewei Li, Shihao Zhou, Ning Zhang, Jianming Zhang, Lu Zong
Summary: A tough, long-lasting adhesive and highly conductive nanocomposite hydrogel (PACPH) was fabricated via the synergy of interfacial entanglement and adhesion group densification. PACPH possesses excellent mechanical properties, interfacial adhesion strength, and conductivity, making it a promising material for long-term monitoring of human activities and electrocardiogram signals.
Article
Chemistry, Multidisciplinary
Zichao Wei, Audrey Vandergriff, Chung-Hao Liu, Maham Liaqat, Mu-Ping Nieh, Yu Lei, Jie He
Summary: We have developed a simple method to prepare polymer-grafted plasmonic metal nanoparticles with pH-responsive surface-enhanced Raman scattering. By using pH-responsive polymers as ligands, the aggregation of nanoparticles can be controlled, leading to enhanced SERS. The pH-responsive polymer-grafted nanoparticles show high reproducibility and sensitivity in solution, providing a novel approach for SERS without the need for sample pre-concentration.
Article
Chemistry, Multidisciplinary
Melis Ozge Alas Colak, Ahmet Gungor, Merve Buldu Akturk, Emre Erdem, Rukan Genc
Summary: This research investigates the effect of functionalizing carbon dots with hydroxyl polymers on their performance as electrode materials in a supercapacitor. The results show that the functionalized carbon dots exhibit excellent electrochemical performance and improved stability.