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single-layer crystalline triazine-based organic framework photocatalysts with different linking groups for H_(2)O_(2)production

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Chinese Journal of Structural Chemistry 2023年第12期42卷 33-42页

作者： Jing Wang Zhongliao Wang Jinfeng Zhang Kai Dai Laboratory of Green and Precise Synthetic Chemistry and Applications Ministry of EducationAnhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental RemediationAnhui Province Key Laboratory of Intelligent Computing and ApplicationsAnhui Province Industrial Generic Technology Research Center for Alurnics MaterialsHuaibei Normal UniversityHuaibei235000PR China

Harnessing solar energy for photocatalytic hydrogen peroxide(H_(2)O_(2))synthesis represents a pinnacle of environmentally-sensitive and sustainable *** single-layer crystalline triazine-based organic frameworks(CTFs)are known for their prodigious photocatalytic potential in H_(2)O_(2)generation,ramifications of the connecting group within the triazine ring(TR)on underlying photocatalytic mechanism warrant deeper *** this study,we simulate three distinct CTFs characterized by different TR linkers:CTF-1(benzene group(BG)),CTF-2(horizontally-oriented naphthyl group(NGH)),and CTF-DCN(vertically-oriented naphthyl group(NGV)).These diverse TR linkers profoundly modulate the absorption band edge of CTFs,subsequently dictating the orientation and constitution of the frontier *** modulation plays a decisive role in determining the requisite energy for photoexcitation in CTFs,orchestrating the generation and distribution of photo-induced electrons and ***,the NGV linkage imparts CTF-DCN with unparalleled light ab-sorption,superior charge separation efficiency,and the lowest energy barrier for associated *** this investigation,we illuminate the pivotal influence of TR linkers in sculpting the photocatalytic dynamics of CTFs,providing fresh perspectives for architecting CTFs with amplified photocatalytic prowess in H_(2)O_(2)synthesis.

关键词： single-layer CTFs H_(2)O_(2)photoreduction DFT calculation Structural design

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Broadband high-performance microwave absorption of the single-layer Ti_(3)C_(2)T_(x)MXene

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Journal of Materials Science & Technology 2022年第20期115卷 148-155页

作者： Xuejiao Zhou Junwu Wen Zhenni Wang Xiaohua Ma Hongjing Wu School of Advanced Materials and Nanotechnology Xidian UniversityXi’an 710071China State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Xidian UniversityXi’an 710071China MOE Key Laboratory of Material Physics and Chemistry under Extraordinary School of Physical Science and TechnologyNorthwestern Polytechnical UniverstyXi’an 710072China

MXenes,a family of two-dimensional(2D)materials,exhibit peculiar microwave-absorbing behaviors due to their unique chemical composition and *** laminated Ti_(3)C_(2)T_(x) MXenes with a multilayer structure have been used for microwave absorption,real 2D MXenes with a single-layer structure have not yet been ***,the electromagnetic wave response behavior of single-layer Ti_(3)C_(2)T_(x) MXenes was explored in *** permittivity of Ti_(3)C_(2)T_(x) MXene rises dramatically with an increase in filler loading,and Ti_(3)C_(2)T_(x) MXene features a distinct dielectric response wherein dipolar polarization and interfacial polarization makes a greater contribution at low filler loading;conductive loss becomes more prominent at high filler *** laminated Ti_(3)C_(2)T_(x) MXene,single-layer Ti_(3)C_(2)T_(x) MXene delivers superior absorbing capability:The RLminvalue of SL-Ti_(3)C_(2)T_(x)-22%reaches-43.5 d B at 6.5 GHz,and a broad EAB of 6.88 GHz can be attained at a thickness of 1.8 mm due to enhanced dipolar polarization,interfacial polarization,and conductive *** work is of great significance in guiding the future development of MXene-based absorbers.

关键词： Microwave absorption Ti_(3)C_(2)T_(x)MXene single-layer Conductive loss

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Enhanced NO_2 gas sensing of a single-layer MoS_2 by photogating and piezo-phototronic effects

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Science Bulletin 2019年第2期64卷 128-135页

作者： Junmeng Guo Rongmei Wen Junyi Zhai Zhong Lin Wang CAS Center for Excellence in Nanoscience Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences School of Nanoscience and Technology University of Chinese Academy of Sciences Center on Nanoenergy Research School of Physical Science and Technology Guangxi University School of Materials Science and Engineering Georgia Institute of Technology

NO_2 sensors with ultrahigh sensitivity are demanded for future electronic sensing systems. However,traditional sensors are considerably limited by the relative low sensitivity, high cost and complicated process. Here, we report a simply and reliable flexible NO_2 sensor based on single-layer MoS_2. The flexible sensor exhibits high sensitivity to NO_2 gas due to ultra-large specific surface area and the nature of two-dimensional(2 D) semiconductor. When the NO_2 is 400 ppb(parts per billion), compared with the dark and strain-free conditions, the sensitivity of the single-layer sensor is enhanced to 671% with a625 nm red light-emitting diode(LED) illumination of 4 mW/cm^2 power under 0.67% tensile *** important, the response time is dramatically reduced to $16 s and it only needs $65 s to complete90% recovery. A theoretical model is proposed to discuss the microscopic mechanisms. We find that the remarkable sensing characteristics are the result of coupling among piezoelectricity, photoelectricity and adsorption-desorption induced charges transfer in the single-layer MoS_2 Schottky junction based *** work opens up the way to further enhancements in the sensitivity of gas sensor based on single-layer MoS_2 by introducing photogating and piezo-phototronic effects in mesoscopic systems.

关键词： Ultrahigh sensitivity Flexible NO2 sensor single-layer MoS2 Photogating effect Piezo-phototronic effect

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Pseudohalide induced tunable electronic and excitonic properties in two-dimensional single-layer perovskite for photovoltaics and photoelectronic applications

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Journal of Energy Chemistry 2019年第9期28卷 106-113页

作者： Zhuo Xu Ming Chen Shengzhong(Frank)Liu Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Normal UniversityXi'an 710119 Shaanxi China Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Normal UniversityXi'an 710119 Shaanxi China Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials Shaanxi Normal UniversityXi'an 710119 Shaanxi China School of Materials Science and Engineering Shaanxi Normal UniversityXi'an 710119 Shaanxi China iChEM Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 Liaoning China University of the Chinese Academy of Sciences Beijing 100039 China

Two-dimensional(2D) layered organic-inorganic hybrid perovskites have attracted much more attention for some applications than their three-dimensional(3D) perovskite counterparts due to their promising thermal and moisture *** particular, the 2D perovskite devices have shown better promise for optoelectronic ***, tunability of optoelectronic properties is often demanded to improve the device ***, we adopt a newly method to tune the electronic properties of 2D perovskite by introducing pseudohalide into the *** this work, we designed a pseudohalidesubstituted 2D perovskite by substituting the out-of-plane halide with pseudohalide and studied the electronic and excitonic properties of 2D-BA2MX4 and 2D-BA2MX2Ps2(M=Ge^(2+), Sn^(2+), and Pb^(2+);X=I;Ps=NCO, NCS, OCN, SCN, Se CN).We revealed the dependence of electronic properties including band gaps, composition of band edges, bonding characteristics, work functions, effective masses, and exciton binding energies on different pseudohalides substituted in 2D *** results indicate that the substitution of pseudohalide in 2D perovskites is energetically favorable and can significantly affect the bonding characteristics as well as the CBM and VBM that often play major role in determining their performance in optoelectronic *** is expected that the pseudohalide substitution will be helpful in developing more advanced optoelectronic device based on 2D perovskite by optimizing band alignment and promoting charge extraction.

关键词： Pseudohalide induced tunable electronic and excitonic properties in two-dimensional single-layer perovskite for photovoltaics and photoelectronic applications

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Electronic Structures and Optical Properties of Ga Doped single-layer Indium Nitride

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Chinese Journal of Chemical Physics 2018年第3期31卷 313-317,368页

作者： Zhi-wei Li De-ping Guo Guang-yi Huang Wang-li Tao Man-yi Duan College of Physics and Electronic Engineering Sichuan Normal UniversityChengdu 610101China Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800China

Electronic structures and optical properties of single-layer In1-xGaxN are studied by employ-ing Heyd-Scuseria-Ernzerh(HSE)method based on the *** band structure and density of states(DOS)of single-layer In1-xGaxN are calculated,and the band gap ranges from 1.8 eV to 3.8 eV as the ratio x changes,illustrating the potential for the tun-ability of band gap values via Ga *** also have investigated optical properties of single-layer In1-xGaxN such as dielectric function,refractive index and absorption coeficient,the main peak of dielectric function spectrum and the absorption edge are found to have a remarkable blue-shift as the concentration of Ga ***,the optical properties of single-layer In1-xGaxN are analyzed based on the band structures and DOS *** unique optical properties have profound application in nanoelectronics and optical devices.

关键词： Electronic structure Optical properties single-layer In1-xGaxN Heyd-Scuseria-Ernzerh method

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Superconducting single-layer T-Graphene and Novel Synthesis Routes

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中国物理快报：英文版 2019年第9期36卷 46-63页

作者：顾琴燕邢定钰孙建 National Laboratory of Solid State Microstructures School of Physics and Collaborative Innovation Center of Advanced MicrostructuresNanjing University

single-layer superconductors are ideal materials for fabricating superconducting nano ***,up to date,very few single-layer elemental superconductors have been predicted and especially no one has been successfully synthesized ***,using crystal structure search techniques and ab initio calculations,we predict that a single-layer planar carbon sheet with 4-and 8-membered rings called T-graphene is a new intrinsic elemental superconductor with superconducting critical temperature(Tc)up to around 20.8 *** importantly,we propose a synthesis route to obtain such a single-layer T-graphene,that is,a T-graphene potassium intercalation compound(C4 K with P4/mmm symmetry)is firstly synthesized at high pressure(>11.5 GPa)and then quenched to ambient condition;and finally,the single-layer T-graphene can be either exfoliated using the electrochemical method from the bulk C4 K,or peeled off from bulk T-graphite C4,where C4 can be obtained from C4 K by evaporating the K ***,we find that the calculated Tc of C4 K is about 30.4 K at 0 GPa,which sets a new record for layered carbon-based *** present findings add a new class of carbon-based *** particular,once the single-layer T-graphene is synthesized,it can pave the way for fabricating superconducting devices together with other 2 D materials using the layer-by-layer growth techniques.

关键词： red Superconducting single-layer T-Graphene and Novel Synthesis Routes Graphene

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Theoretical Proposal for a Planar single-layer Carbon That Shows a Potential in Superconductivity

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Chinese Physics Letters 2019年第9期36卷 4-4页

作者：马琰铭 State Key Lab of Superhard Materials College of PhysicsJilin University

single-layer superconductors[1]have been the subject of considerable interests as they are ideal systems for the fundamental understanding of two-dimensional(2D)physics and for device applications.A few singlelayer superconductors are experimentally achieved(e.g.,FeSe,MoS2,and NbSe2[2-4]in the field where either charge doping or tensile strain is often required to promote the superconductivity.

关键词： Theoretical Proposal for a Planar single-layer Carbon That Shows a Potential in Superconductivity

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Effect of single- versus Double-layer Uterine Closure during Caesarean Section on Niche Formation and Menstrual Irregularity

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Open Journal of Obstetrics and Gynecology 2024年第1期14卷 57-68页

作者： Mohamed Samy Esraa Hussein Fouad Ghoneimy Walid Hitler Department of Obstetrics and Gynaecology Faculty of Medicine Ain Shams University Cairo Egypt

Background: The myometrium at the location of the CS (caesarean section) scars, also known as residual myometrium thickness (RMT), is larger after a double-layer uterine closure procedure than following a single-layer one. It may lessen the formation of a niche that is the myometrium’s disruption at the location of the scar of the uterus. Gynecological manifestations, obstetric problems in a future pregnancy and birth, and maybe subfertility are linked to thin RMT and a niche. Objective: To ascertain if double-layer unlocked closure of the uterus is better than single-layer one in terms of post-menstrual spotting and niche development following a first CS. Patients and Methods: In this randomized clinical study, 287 patients were evaluated for qualifying. Of all eligible individuals, 57 patients were excluded from the study based on the inclusion criteria. Results: The variation in ages, gestational age, body mass index (BMI), and cesarean section indications between the two assigned groups is statistically insignificant. However, postmenstrual spotting was statistically significantly more common in single-layer group compared to in double-group. The current study revealed ultrasound findings suggestive of niche formation was statistically significantly more common in single-layer group compared to in double-layer group. Conclusion: As evident from the current study, it demonstrates the advantages of double-layer unlocked closure of the uterus over single-layer one in terms of post-menstrual spotting and niche development following first-time cs. Thus, we deduced that fewer niches are formed, and fewer menstrual spotting occurs in the presence of double unlocked layers closure. To ascertain the impact of uterus closure method on post-operative niche development and the risk of obstetrics and gynaecological problems, further prospective trials with extended follow-up periods are required.

关键词： single-layer Double Caesarean Section Residual Myometrium Thickness

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Shaking table test and numerical simulation of an isolated cylindrical latticed shell under multiple-support excitations

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Earthquake Engineering and Engineering Vibration 2019年第3期18卷 611-630页

作者： Xue Suduo Shan Mingyue Li Xiongyan Liang Shuanzhu Huang Fuyun Liu Yi Spatial Structures Research Center Beijing University of Technology Beijing 100124 China College of Civil Engineering Fuzhou University Fuzhou 350108 China

In order to study the infl uence of the ground motion spatial eff ect on the seismic response of large span spatial structures with isolation bearings, a single-layer cylindrical latticed shell scale model with a similarity ratio of 1/10 was constructed. An earthquake simulation shaking table test on the response under multiple-support excitations was performed with the high-position seismic isolation method using high damping rubber (HDR) bearings. Small-amplitude sinusoidal waves and seismic wave records with various spectral characteristics were applied to the model. The dynamic characteristics of the model and the seismic isolation eff ect on it were analyzed at varying apparent wave velocities, namely infi nitely great, 1000 m/s, 500 m/s and 250 m/s. Besides, numerical simulations were carried out by Matlab software. According to the comparison results, the numerical results agreed well with the experimental data. Moreover, the results showed that the latticed shell roof exhibited a translational motion as a rigid body after the installation of the HDR bearings with a much lower natural frequency, higher damping ratio and only 1/2~1/8 of the acceleration response peak values. Meanwhile, the structural responses and the bearing deformations at the output end of the seismic waves were greatly increased under multiple-support excitations.

关键词： single-layer cylindrical latticed shell HDR bearings seismic isolation multiple-support excitations shaking table test

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