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Janus MXene film with gradient structure for highly efficient terahertz and infrared electromagnetic absorption

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Nano Research 2025年第1期18卷 434-442页

作者： Shaodian Yang Weiqiang Huang Zhiqiang Lin Zibo Chen Rongliang Yang Yi Jia Xuebin Liu Rui Wang Zhiping Zeng Yougen Hu Huanjun Chen Xuchun Gui11 State key laboratory of Optoelectronic materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China National key laboratory of materials for Integrated Circuits Shenzhen Institute of Advanced Electronic MaterialsShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China China Academy of Aerospace Science and Innovation Beijing 100176China guangdong province key laboratory of display material and technology Guangzhou 510275China School of materials Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China

Electromagnetic interference (EMI) shielding inhigh-frequency range, especially the rapidly growing terahertz(THz) frequency range, attracts increasing attention due tothe potential application of terahertz in 6G wirelesscommunication, and security inspection. However, traditionalconductive EMI films typically achieve high shieldingeffectiveness through strong reflection, which may causesecondary pollution to other devices. Here, a gradientstructure strategy was proposed to constructTi_(3)C_(2)Tx/hydroxypropyl methyl cellulose (HPMC) film, in whichthe content of Ti_(3)C_(2)Tx gradually increases along the thicknessdirection, resulting in different conductivity of the two surfaces(surface-M and surface-H) for the film. The obtained gradientfilmexhibits an EMI shielding efficiency of over 48.5 dB in theTHz range (0.2-1.6 THz) at a thickness of 40 μm. Especially,as the THz waves incident from the surface-H to the film, the absorption effectiveness reaches 48.2 dB (average absorbedpower loss up to 91.4%), and the reflection effectiveness is only 0.3 dB. In additions, the gradient-film also demonstrates ahigh absorption rate of 95.5% in the infrared band (2.5-16.7 μm). Moreover, the gradient-film exhibits an excellent tensilestress and Young’s modulus value of 173.1 MPa and 2.8 GPa, respectively. Therefore, the gradient-film proposed in thiswork, with excellent electromagnetic absorption in both THz and infrared band, provides a promising candidate for the nextgenerationEMI shielding applications.

关键词： electromagnetic interference shielding Janus film terahertz MXene

CO2在p族催化剂Ga2O3上的吸附与活化（英文）

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Science China materials 2025年

作者：刘之壮匡晓旭李宝文孙成华涂溶章嵩 Chaozhou Branch of Chemistry and Chemical Engineering guangdong laboratory School of materials Science and Engineering Wuhan University of Technology Department of Chemistry and Biotechnology Swinburne University of Technology State key laboratory of Advanced technology for materials Synthesis and Processing Wuhan University of Technology

处于极端环境下的中高温工业废气中CO2的固定和转化是一项兼具重要科学意义和挑战性的任务.Ga2O3是一种稳定的p-族化合物在热催化高温CO2废气中表现出惊人的活性,但我们其仍不清楚其反应机理.在本工作中,我们用密度泛函理论研究了11种不...

处于极端环境下的中高温工业废气中CO2的固定和转化是一项兼具重要科学意义和挑战性的任务.Ga2O3是一种稳定的p-族化合物在热催化高温CO2废气中表现出惊人的活性,但我们其仍不清楚其反应机理.在本工作中,我们用密度泛函理论研究了11种不同Ga2O3表面的CO2的吸附和活化过程.电荷转移和化学键分析表明,在基底表面Ga阳离子和O阴离子之间强大的协同效应驱动下,同时出现了电子增加和电子减少两种不同的CO2活化机制.与单一活性位点相比,这种Ga-O协同作用提高了CO2的活化效率,其中CO2δ+阳离子比CO2δ–阴离子更容易捕获H原子.据我们所知,这种双重活化机制以前从未被报道过,尤其是对于p族催化剂.我们的发现为中高温CO2废气排放的直接催化转化提供了新的见解,并为处理CO2尾气的工业级催化剂的设计提供了合理的策略.

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Preparation of few-layer graphene-capped boron nanowires and their field emission properties

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Chinese Physics B 2016年第7期25卷 472-475页

作者：张永欣刘飞申承民杨天中李军邓少芝许宁生高鸿钧 Beijing National laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences State key laboratory of Optoelectronic materials and Technologies Guangdong Province Key Laboratory of Display Material and Technologyand School of Microelectronics Sun Yat-sen University

Large-area boron nanowire（BNW） films were fabricated on the Si（111） substrate by chemical vapor deposition（CVD）. The average diameter of the BNWs is about 20 nm, with lengths of 5–10 μm. Then, graphene-capped boron nanowires（GC-BNWs） were obtained by microwave plasma chemical vapor deposition（MPCVD）. Characterization by scanning electron microscopy indicates that few-layer graphene covers the surface of the boron nanowires. Field emission measurements of the BNWs and GC-BNW films show that the GC-BNW films have a lower turn-on electric field than the BNW films.

关键词： boron nanowires graphene-capped boron nanowires field emission properties

Preparation of patterned boron nanowire films with different widths of unit-cell and their field emission properties

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Chinese Physics B 2016年第8期25卷 407-411页

作者：张永欣刘飞申承民李军邓少芝许宁生高鸿钧 Beijing National laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences State key laboratory of Optoelectronic materials and Technologies Guangdong Province Key Laboratory of Display Material and Technologyand School of Microelectronics Sun Yat-sen University

Large-area patterned films of boron nanowires（BNWs） are fabricated at various densities by chemical vapor deposition（CVD）. Different widths of unit-cell of Mo masks are used as templates. The widths of unit-cell of Mo masks are100 μm, 150 μm, and 200 μm, respectively. The distance between unit cells is 50 μm. The BNWs have an average diameter of about 20 nm and lengths of 10 μm–20 μm. High-resolution transmission electron microscopy analysis shows that each nanowire has a β-tetragonal structure with good crystallization. Field emission measurements of the BNW films show that their turn-on electric fields decrease with width of unit-cell increasing.

关键词： patterned boron nanowires different width of unit-cell field emission properties

Ultra-low frequency magnetic energy focusing for highly effective wireless powering of deep-tissue implantable electronic devices

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National Science Review 2024年第5期11卷 272-290页

作者： Yuanyuan Li Zhipeng Chen Yuxin Liu Zijian Liu Tong Wu Yuanxi Zhang Lelun Peng Xinshuo Huang Shuang Huang Xudong Lin Xi Xie Lelun Jiang guangdong Provincial key laboratory of Sensor technology and Biomedical Instrument School of Biomedical EngineeringShenzhen Campus of Sun Yat-Sen University School of Mechanical and Electrical Engineering Guangzhou University State key laboratory of Optoelectronic materials and Technologies Guangdong Province Key Laboratory of Display Material and Technology School of Electronics and Information Technology Sun Yat-Sen University

The limited lifespan of batteries is a challenge in the application of implantable electronic devices. Existing wireless power technologies such as ultrasound, near-infrared light and magnetic fields cannot charge devices implanted in deep tissues, resulting in energy attenuation through tissues and thermal ***, an ultra-low frequency magnetic energy focusing(ULFMEF) methodology was developed for the highly effective wireless powering of deep-tissue implantable devices. A portable transmitter was used to output the low-frequency magnetic field(<50 Hz), which remotely drives the synchronous rotation of a magnetic core integrated within the pellet-like implantable device, generating an internal rotating magnetic field to induce wireless electricity on the coupled coils of the device. The ULFMEF can achieve energy transfer across thick tissues(up to 20 cm) with excellent transferred power(4–15 mW) and non-heat effects in tissues, which is remarkably superior to existing wireless powering technologies. The ULFMEF is demonstrated to wirelessly power implantable micro-LED devices for optogenetic neuromodulation, and wirelessly charged an implantable battery for programmable electrical stimulation on the sciatic nerve. It also bypassed thick and tough protective shells to power the implanted devices. The ULFMEF thus offers a highly advanced methodology for the generation of wireless powered biodevices.

关键词： ultra-low frequency transcutaneous energy transmission electromagnetic generator implantable electronic device deep tissue

Minimally invasive technology for continuous glucosemonitoring

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Bio-Design and Manufacturing 2022年第1期5卷 9-13页

作者： Xinshuo Huang Jingbo Yang Shuang Huang Hui-jiuan Chen Xi Xie State key laboratory of Optoelectronic materials and Technologies Guangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510006China guangdong Provincial key laboratory of Sensor technology and Biomedical Instrument School of Biomedical EngineeringShenzhen Campus of Sun Yat-Sen UniversityShenzhen 518107China

Introduction Despite the numerous breakthroughs made in medical and biomedical technologies,biosensing underneath the skin without any associated pain still sounds like a dream yet to be *** invasive biosensors refer to functional or electronic sensors that can contact the interior environment of living organisms and their biological tissues,while the connected bulk devices remain on the surface of the biological objects[1].Minimally invasive biosensors are currently a key research area because they can not only meet the increasing technical demands to precisely detect biological activities inside biological objects,but also provide an ideal platform to externally incorporate complicated functionalities and electronic integration[2].The current development level of minimally invasive sensing still necessitates solving the constraints and bottlenecks in the three aspects of functionalities,sensitivity and biocompatibility[3].In this perspective,we select minimally invasive sensors as a representative research object with the aim to solve the limitations of current diabetes diagnosis and treatment approaches.

关键词： breakthrough interior diagnosis

Tumor-on-a-chip:from bioinspired design to biomedical application

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Microsystems & Nanoengineering 2021年第3期7卷 27-49页

作者： Xingxing Liu Jiaru Fang Shuang Huang Xiaoxue Wu Xi Xie Ji Wang Fanmao Liu Meng Zhang Zhenwei Peng Ning Hu The First Affiliated Hospital of Sun Yat-Sen University State Key Laboratory of Optoelectr onic Materials and TechnologiesGuangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologySun Yat-Sen University510006 GuangzhouChina State key laboratory of Transducer technology Chinese Academy of Sciences200050 ShanghaiChina

Cancer is one of the leading causes of human death,despite enormous efforts to explore cancer biology and develop anticancer *** main challenges in cancer research are establishing an efficient tumor microenvironment in vitro and exploring efficient means for screening anticancer drugs to reveal the nature of cancer and develop *** tumor microenvironment possesses human-specific biophysical and biochemical factors that are difficult to recapitulate in conventional in vitro planar cell models and in vivo animal ***,model limitations have hindered the translation of basic research findings to clinical *** this review,we introduce the recent progress in tumor-on-a-chip devices for cancer biology research,medicine assessment,and biomedical applications in *** emerging tumor-on-a-chip platforms integrating 3D cell culture,microfluidic tech no logy,and tissue engineeri ng have successfully mimicked the pivotal structural and functional characteristics of the in vivo tumor *** recent advances in tumor-on-a-chip platforms for cancer biology studies and biomedical applications are detailed and an a lyzed in this *** review should be valuable for further understanding the mechanisms of the tumor evolution process,screening anticancer drugs,and developing cancer therapies,and it addresses the challenges and potential opportunities in predicting drug screening and cancer treatment.

关键词： drugs integrating establishing

Nanowires mediated growth ofβ-Ga_(2)O_(3)nanobelts for hightemperature(>573 K)solar-blind photodetectors

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Nano Research 2023年第4期16卷 5548-5554页

作者： Xiaobin Zou Dongyu Xie Yong Sun Chengxin Wang State key laboratory of Optoelectronic materials and Technologies School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China State key laboratory of Optoelectronic materials and Technologies and guangdong province key laboratory of display material and technology School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China

β-Ga_(2)O_(3),with ultra-wide bandgap,high absorption coefficient for high-energy ultraviolet(UV)photons,and high structural stability toward harsh-environment,has been receiving persistent attention for deep ultraviolet photodetectors ***,realization of devices with high tolerance toward high temperature faces great challenges due to considerable background signals mainly arising from abundant thermal excited ***,nanowire-mediated high-qualityβ-Ga_(2)O_(3)nanobelts with ultra-thin thickness and length up to several hundred micrometers were achieved via a simple catalyst-free chemical vapor deposition *** resulted microdevice output superior optoelectric figure of merits among numerous reports aboutβ-Ga_(2)O_(3),i.e.,ultra-low dark current(below the detection limit of 10−12 A),high responsivity(1,320 A/W),and high spectral selectivity working under low voltage(~2 V).More importantly,the performance remains robust at elevated temperature higher than 573 *** results indicate a large prospect for low-voltage driven deep ultraviolet photodetectors with good sensitivity and stability at harsh environments.

关键词： β-Ga_(2)O_(3) low-dimensional nanostructures chemical vapor deposition high temperature photodetectors solar-blind photodetectors

Fluorescent,multifunctional anti-counterfeiting,fast response electrophoretic display based on TiO_(2)/CsPbBr_(3)composite particles

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Light(Science & Applications) 2024年第10期13卷 2168-2178页

作者： Guangyou Liu Xinzao Wu Feng Xiong Jinglan Yang Yunhe Liu Jie Liu Zhuohang Li Zong Qin Shaozhi Deng Bo-Ru Yang State key laboratory of Opto-electronic materials and technology.guangdong province key laboratory of display materials and Technologies School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510006China

Traditional optical anti-counterfeiting(AC)is achieved by static printed images,which makes them susceptible to lower levels of security and easier ***,it is essential to develop AC device with dynamic modulation for higher *** display(EPD)has the advantages of low power consumption,high ambient contrast ratio,and capability of showing dynamic images which is suitable for dynamic AC ***,we prepared a dynamical AC device based on a fluorescent EPD,and achieving the image switch between black,white,and green fluorescence states under the dual-mode driving(electronic field and Uv light).We loaded perovskite quantum dots(CsPbBr_(3))onto the TiO_(2) particles and further prepared fluorescent electrophoretic particles TiO_(2)/CsPbBr_(3)-3-PLMA(TiO/CPB-3)by grafting and polymerizing *** addition,We fabricated the AC devices based on the fluorescent EPD,which exhibits the multifunctional AC,where the fluorescent EPD has a fast response time of 350 ms,a high contrast ratio of 17,and bright green *** prototype demonstrates a new way for future dynamic AC and identification.

关键词： dynamic composite ambient