Article
Nanoscience & Nanotechnology
Sae Katsuro, Weifang Lu, Kazuma Ito, Nanami Nakayama, Shiori Yamamura, Yukimi Jinno, Soma Inaba, Ayaka Shima, Naoki Sone, Dong-Pyo Han, Kai Huang, Motoaki Iwaya, Tetsuya Takeuchi, Satoshi Kamiyama
Summary: This study investigates the improvement of optical properties and the realization of micro-LEDs by removing the (0001) plane region in GaInN/GaN MQS NWs. The results show that the EL intensity can be enhanced by removing the (0001) plane region, and the light output of truncated samples can be increased for more than ten times compared to the samples without (0001) plane etching.
Article
Nanoscience & Nanotechnology
Lu Song, Jaewan Ahn, Dong-Ha Kim, Hamin Shin, Il-Doo Kim
Summary: In this study, hollow Pd-Sn alloy nanotubes with ultrafine grain sizes were successfully fabricated for highly sensitive hydrogen gas detection. The alloying of Pd with Sn effectively prevented degradation of sensing performance, and the highly porous structure with smaller nanograins offered more exposed active sites and higher gas accessibility to bulk materials. The resultant Pd-Sn NTs exhibited excellent sensitivity toward H2, with a outstanding achievement in achieving a detection limit of 0.0001% among state-of-the-art H2 sensors.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Lu Song, Jaewan Ahn, Dong-Ha Kim, Hamin Shin, Il-Doo Kim
Summary: This study successfully fabricated Pd-Sn alloy nanotubes with excellent sensitivity and stability, which can be used as an efficient room temperature H2 gas sensor.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Aifa Sun, Huimin Yu, Yue Zhou, Yangquan Liu, Jingting Luo, Ping Fan, Aihua Zhong
Summary: A Pd gated HEMT device with high sensitivity to low concentrations of hydrogen gas was demonstrated, showing fast response and short response/recovery times, while having no response to certain gases and enhanced sensing performance under light illumination.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Analytical
Dan Han, Xiaomei Han, Xiaoru Liu, Junzhao Zhang, Li Zhao, Xiuli He, Weidong Wang, Bingshe Xu, Shengbo Sang
Summary: Here, we present the fabrication of two ammonia gas sensors based on p-type GaN hexagonal pits (GaN-HP)/Polyaniline (PANI) heterostructures using wet etching and in situ polymerization. The morphology and structure of the GaN-HP/PANI sensors were characterized, showing improved gas sensing performance compared to pure PANI. The sensor based on GaN-HP/PANI-2 exhibited a significantly higher response towards NH3, attributed to its higher specific surface area, stronger protonation degree of PANI, and synergistic effects of the p-p junction effect. This study provides valuable insights for the development of high-performance GaN-HP/PANI-based gas sensors.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Multidisciplinary
June-Heang Choi, Taehyun Park, Jaehyun Hur, Ho-Young Cha
Summary: An AlGaN/GaN heterostructure based hydrogen sensor was fabricated with a dual catalyst layer of ZnO-nanoparticles atop a Pd catalyst film. The sensor operated at room temperature without heating, thanks to the photocatalytic reaction of ZnO-NPs with ultraviolet illumination. It showed a sensing response of 25% for a hydrogen concentration of 4% at room temperature, with fast response and recovery times of 8 s and 11 s, respectively.
Article
Chemistry, Analytical
Aihua Zhong, Bowei Shen, Tao Wang, Hao Jin, Yizhu Xie, Dongping Zhang, Huayao Li, Huan Liu, Jingting Luo, Ping Fan
Summary: The GaN honeycomb nanonetwork can be used to fabricate high-performance H-2 gas sensors, demonstrating fast response time and small detection limit.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Crystallography
Amalia Fernando-Saavedra, Steven Albert, Ana Bengoechea-Encabo, Achim Trampert, Mengyao Xie, Miguel A. Sanchez-Garcia, Enrique Calleja
Summary: Non-polar m-plane GaN films were grown on & gamma;-LiAlO2 (100) substrates using a two-step process that involved coalescence of GaN nanocolumns obtained from a GaN buffer. Transmission electron microscopy data showed a significant reduction in extended defects density in the coalesced film compared to the initial GaN buffer, likely due to a filter effect during the regrowth process. Low temperature photoluminescence spectra confirmed this reduction in defects, with a decrease in stacking faults emission peaks and a dominant donor-bound excitonic emission at 3.472 eV.
JOURNAL OF CRYSTAL GROWTH
(2023)
Article
Physics, Applied
Yaqiang Liao, Tao Chen, Jia Wang, Wentao Cai, Yuto Ando, Xu Yang, Hirotaka Watanabe, Atsushi Tanaka, Shugo Nitta, Yoshio Honda, Kevin J. Chen, Hiroshi Amano
Summary: This work proposes a deliberate etching-based top-down approach for fabricating GaN nanorod Schottky barrier diodes. The impact of the wet-etching process on device performance is systematically studied. The results show that the wet-etching process can significantly improve the performance of the NR SBD, with a low forward turn-on voltage, high current density, and good ON/OFF current ratio.
APPLIED PHYSICS LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Daisuke Ohori, Takahiro Ishihara, Xuelun Wang, Kazuhiko Endo, Tsou-Hwa Hsieh, Yiming Li, Nobuhiro Natori, Kazuma Matsui, Seiji Samukawa
Summary: In this study, the etching characteristics of hydrogen iodide (HI) neutral beam etching (NBE) of GaN and InGaN were investigated and compared with Cl-2 NBE. The advantages of HI NBE over Cl-2 NBE were demonstrated, including higher InGaN etch rate, better surface smoothness, and reduced etching residues. It was found that HI NBE had higher reactivity with In, resulting in higher InGaN etch rates and thinner reaction layers. Additionally, HI NBE suppressed defect generation and yellow luminescence intensity increase after etching. Therefore, HI NBE shows potential for high throughput fabrication of micro LEDs.
Article
Energy & Fuels
Nedal Al Taradeh, Eric Frayssinet, Christophe Rodriguez, Frederic Morancho, Camille Sonneville, Luong-Viet Phung, Ali Soltani, Florian Tendille, Yvon Cordier, Hassan Maher
Summary: This paper proposes a new technique to engineer the Fin channel in vertical GaN FinFET, and details the GaN wet etching process in TMAH solution. The study finds that m-GaN plane has lower surface roughness, and UV light enhances etching rates on m and a-GaN crystal planes significantly.
Article
Chemistry, Multidisciplinary
Vladimir Ivantsov
Summary: A spontaneous change in growth orientation from polar c to nonpolar a-plane was observed during hydride vapor-phase epitaxy of GaN on c-plane sapphire substrates. The transition did not follow the gradual transformation commonly seen in geometric selection, but instead had an abrupt change from one orientation to another above the substrate surface. Twinning was observed in the epitaxial layers, suggesting that faceting of the sapphire surface, particularly with r-facets, played a crucial role in the reorientation effect. This study highlights the importance of r-faceting for growth on c-plane sapphire, as well as on m- and a-planes.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Analytical
Wei-Cheng Chen, Jing-Shiuan Niu, I-Ping Liu, Bu-Yuan Ke, Shiou-Ying Cheng, Wen-Chau Liu
Summary: A new hydrogen sensor incorporating Pt nanoparticles and film shows high sensitivity and wide detection ranges for hydrogen concentration and operating temperature. Experimental results demonstrate excellent sensing performance with high sensitivity and fast response times.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Analytical
Huimin Yu, Aifa Sun, Yangquan Liu, Yue Zhou, Ping Fan, Jingting Luo, Aihua Zhong
Summary: In this study, a capacitive H2 gas sensor was fabricated using GaN with honeycomb nanonetwork structure, showing ultrafast response time and low detection limits towards H2 gas. The sensor also exhibits minimal response to other gases, highlighting its high selectivity for H2 detection purposes.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Materials Science, Multidisciplinary
Ezzah A. Alias, Norasmida Ibrahim, Steven P. DenBaars, Narong Chanlek, M. Ikram Md Taib, Norzaini Zainal
Summary: This study aimed to improve the roughening on the backside of GaN substrate by increasing the density of hexagonal pyramids, which led to enhanced performance of GaN-on-GaN LEDs. Oxygen pre-annealing resulted in higher density of hexagonal pyramids and improved GaN-on-GaN LED emission, demonstrating potential for improved LED performance through backside GaN roughening with oxygen pre-annealing.
Article
Chemistry, Analytical
Mengmeng Guo, Na Luo, Yueling Bai, Zhenggang Xue, Qingmin Hu, Jiaqiang Xu
Summary: A porous heterostructure WO3-C/In2O3 was designed and prepared for a miniature H2 sensor, which showed higher response value, lower operating temperature, fast response-recovery speed, and low limit of detection.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Feng Hu, Hui Hu, Yuting Li, Xiaohui Wang, Xiaowen Shi
Summary: Arsenic contamination in water bodies is a significant health risk. This study developed a chitosan-catechol modified electrode for rapid and accurate detection of trace amounts of arsenic. The modified electrode demonstrated good detection capability and resistance to ionic interference, making it suitable for in situ detection.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Yantao Zhang, Qian Liu, Tao Tian, Chunhua Xu, Pengli Yang, Lianju Ma, Yi Hou, Hui Zhou, Yongjun Gan
Summary: In this study, a lysosome-targeting buffering fluorogenic probe (Lyso-BFP) was designed and synthesized, demonstrating excellent photostability, pH specificity, and responsiveness to lysosomal acidification in living cells. The performance of Lyso-BFP in pH sensing was attributed to the inhibition of the photo-induced electron transfer process. Lyso-BFP allowed for wash-free imaging and long-term real-time monitoring of lysosome pH changes based on its off-on fluorescence behavior and buffer strategy.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Wei Cai, Wenbo Sun, Jiayue Wang, Xiaokui Huo, Xudong Cao, Xiangge Tian, Xiaochi Ma, Lei Feng
Summary: In this study, a near-infrared fluorescent probe HCBG was developed for imaging of alpha-GLC. HCBG exhibited excellent selectivity and sensitivity towards alpha-GLC in complex bio-samples, and showed good cell permeability for in situ real-time imaging. Through the high-throughput screening system established by HCBG, a natural alpha-GLC inhibitor was successfully isolated and identified. This study provides a novel fluorescence visualization tool for discovering and exploring the biological functions of diabetes-related gut microbiota, and a high-throughput screening approach for alpha-GLC inhibitor.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Trey W. Pittman, Xi Zhang, Chamindie Punyadeera, Charles S. Henry
Summary: Heart failure is a growing epidemic and a significant clinical and public health problem. Researchers have developed a portable and affordable diagnostic device for heart failure that can be used at the point-of-care, providing a valid alternative to current diagnostics approaches.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Anders O. Tjell, Barbara Jud, Roland Schaller-Ammann, Torsten Mayr
Summary: An optical hydrogen peroxide sensor based on catalytic degradation and the detection of produced oxygen is presented. The sensor offers higher resolution and better sensitivity at lower H2O2 concentrations. By removing O2 from the sample solution, a more sensitive O2 sensor can be used for measurement. The sensor has been successfully applied in a flow-through cell to measure H2O2 concentration in different flow rates.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Seong Jae Kim, Ji-hun Jeong, Gaabhin Ryu, Yoon Sick Eom, Sanha Kim
Summary: Surface-enhanced Raman spectroscopy (SERS) is a high-sensitivity, label-free detection method with various analytical applications. Researchers have developed a hydrophobic SERS substrate based on engineered carbon nanotube arrays (CNT-SERS) and studied the role of structural design at both micro and nanoscales. The substrate demonstrated controlled self-enrichment capability and enhanced sensitivity, with a significant increase in the SERS signal. The study also proposed a theoretical model and a concentration strategy inspired by plants for analyte deposition on microarrays.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Dan Zhao, Renjun Jiang, Xiaoqiang Liu, Subbiah Alwarappan
Summary: In this study, a novel ternary composite material was constructed by assembling cerium vanadate nanorods on reduced graphene oxide-microcrystalline cellulose nanosheets, and it was used for real-time monitoring of the concentration of superoxide anions in vivo. The ternary composite showed excellent conductivity, large surface area, and abundant active sites, leading to a wider linear range, high sensitivity, low detection limit, and fast response time for superoxide anion detection.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Tengfei Wang, Liwen Wang, Guang Wu, Dating Tian
Summary: In this study, a covalent organic framework material TaTp-COF with porous and uniform spheres was successfully prepared via hydrothermal reaction, and it was found to significantly enhance the aggregation-induced emission (AIE) of berberine. The unique emission properties of berberine on TaTp-COF were studied and utilized for the sensitive detection of berberine.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Lin Li, Yilei Ding, Lei Xu, Shuoran Chen, Guoliang Dai, Pengju Han, Lixin Lu, Changqing Ye, Yanlin Song
Summary: In this study, a novel TTI based on a ratiometric fluorescent nanosensor is designed, which has the advantages of high accuracy and low cost. Experimental and theoretical investigations confirm its pH responsiveness and demonstrate its good sensitivity and reliability. By monitoring the total volatile basic nitrogen, this TTI can accurately predict food spoilage and can be adaptively modified for different types of food. The TTI based on this nanosensor enables visual monitoring of food quality.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Fangju Chen, Xueting Wang, Wei Chen, Chenwen Shao, Yong Qian
Summary: Lung cancer is the second most common malignant tumor worldwide. Drug resistance in lung cancer leads to treatment failure and recurrence in majority of patients. This study developed a fluorescent prodrug that can be activated in cancer cells to release drugs, and its signal can be tracked by imaging. It shows a unique autophagy-driven ferroptosis effect, indicating its potential for targeting drug-resistant cancer cells.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Weichao Li, Qiming Yuan, Zhangcheng Xia, Xiaoxue Ma, Lifang He, Ling Jin, Xiangfeng Chu, Kui Zhang
Summary: This study developed a high-performance gas sensor for formaldehyde detection by modifying ZnSnO3 with ZnO QDs and SnO2 QDs. The modified sensor showed improved sensing response and lower working temperature. The presence of ZnO QDs formed rich heterojunctions, increased surface area, and provided oxygen deficiency for formaldehyde sensing reaction, thus enhancing the sensor performance. This research provides an alternative method to enhance the sensing properties of MOS by QDs modification.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Joung-Il Moon, Eun Jung Choi, Younju Joung, Jin-Woo Oh, Sang-Woo Joo, Jaebum Choo
Summary: A novel nanoplasmonic substrate was developed for biomedical applications, which showed strong hot spots for detecting biomarkers at low concentrations. The substrate, called AuNPs@M13, was made by immobilizing 60 nm gold nanoparticles onto the surface of an M13 bacteriophage scaffold. It demonstrated higher sensitivity and lower limit of detection compared to commercially available assays.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Ning Li, Ya Zhang, Ying Xu, Xiaofang Liu, Jian Chen, Mei Yang, Changjun Hou, Danqun Huo
Summary: The molecular subtype of breast cancer guides treatment and drug selection. Invasive tests can promote cancer cell metastasis, so the development of high-performance, low-cost diagnostic tools for cancer prognosis is crucial. Liquid biopsy techniques enable noninvasive, real-time, dynamic, multicomponent, quantitative, and long-term observations at the cellular, genetic, and molecular levels. A Cu-Zr metal-organic framework (MOF) nanoenzyme with monatomic Cu attachment has been synthesized and proven to have high catalytic performance. The sensor constructed using this nanoenzyme shows potential for accurate classification of breast cancer serum samples.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Jeongmin Kim, Hyemin Kim, Seunghyun Park, Hyeonaug Hong, Yong Jae Kim, Jiyong Lee, Jaeho Kim, Seung-Woo Cho, Wonhyoung Ryu
Summary: This study presents a method to fabricate independently functioning microneedle (MN) electrodes with narrow intervals for high precision electrochemical sensing. The optimized mixture of photocurable polymer and single-wall carbon nanotubes was used to mold single composite MNs, which were then attached to pre-patterned electrodes. Plasma etching and electropolymerization were performed to enhance the electrochemical activity, and Prussian blue and glucose oxidase were electrodeposited on the MNs for glucose detection. The MN electrodes showed good sensitivity and linearity, and the feasibility of glucose detection was demonstrated in an in vivo mouse study.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)