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Surface-induced Microstructure and Performance Changes in P3HT Ultrathin Films

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Chinese Journal of Polymer Science 2024年第6期42卷 805-814页

作者： Hong-Tao Shan Jia-Xin He Bing-Yan Zhu Xue-Ting Cao Ying-Ying Yan Jian-Jun Zhou Hong Huo Beijing Key laboratory of energy conversion and Storage materials College of ChemistryBeijing Normal UniversityBeijing100875China

In this work,poly(3-hexylthiophene)(P3HT)ultrathin films(P3HT-T)were prepared by spin-coating a dilute P3HT solution(in a toluene:o-dichlorobenzene(Tol:ODCB)blend with a volume ratio of 80:20)with ultrasonication and the addition of the nucleating agent bicycle[2.2.1]heptane-2,3-dicarboxylic acid disodium salt(HPN-68L)on glass,Si wafers and indium tin oxide(ITO)*** electrical and mechanical properties of the P3HT-T ultrathin films were investigated,and it was found that the conductivity and crack onset strain(COS)were simultaneously improved in comparison with those of the corresponding pristine P3HT film(P3HT-0,without ultrasonication and nucleating agent)on the same substrate,regardless of what substrate was ***,the conductivity of P3HT-T ultrathin films on different substrates was similar(varying from 3.7 S·cm^(-1)to 4.4 S·cm^(-1)),yet the COS increased from 97%to 138%by varying the substrate from a Si wafer to *** grazing-incidence wide-angle X-ray diffraction(GIXRD),UV-visible(UV-Vis)spectroscopy and atomic force microscopy(AFM),we found that the solid order and crystallinity of the P3HT-T ultrathin film on the Si wafer are highest,followed by those on glass,and much lower on ***,the surface energy and roughness of three substrates were investigated,and it was found that the polar component of the surface energyγp plays a critical role in determining the crystalline microstructures of P3HT ultrathin films on different *** work indicates that the P3HT ultrathin film can obviously improve the stretchability and simultaneously retain similar electrical performance when a suitable substrate is *** findings offer a new direction for research on stretchable CP ultrathin films to facilitate future practical applications.

关键词： P3HT ultrathin film Substrate Crystalline microstructures Polar component of the surface energy Electrical and stretchable performances

Visual and portable detection of metronidazole realized by metal-organic framework flexible sensor and smartphone scanning

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Chinese Chemical Letters 2024年第10期35卷 526-530页

作者： Xiangshuai Li Jian Zhao Li Luo Zhuohao Jiao Ying Shi Shengli Hou Bin Zhao Department of Chemistry Key Laboratory of Advanced Energy Materials Chemistry Renewable Energy Conversion and Storage Center (RECAST) Nankai University

Metronidazole （MNZ） is a type of antibiotic that can help people and animals cure bacterial in fections,however,abuse of MNZ has posed a threat to human ***,portable and vi sual detection of MNZ is meaningful for food safety and rational administration of drugs,bu full of ***,a porous three-dimensional Tb-based metal-organic framework (MOF{（CH3）2NH2·[Tb5（TDA）8（H2O）2]·6DMF·2C2H5OH}_n（TDA-Tb） with good solvent and p H stabilities was pre pared,and the framework possesses one-dimensional channels with a diameter of 12 A along the c-axis Experiment results suggest that the synthesized TDA-Tb can selectively and sensitively detect MNZ in water,and the limit of detection （LOD） is as low as 4.1×10-7mol/***,a flexible sensor TDA Tb-M was also constructed by incorporating TDA-Tb into membrane materials for convenient *** the TDA-Tb-M firstly realized portable and visual detection of MNZ through smartphone scanning,which may inspire more probes with wide application ranges.

关键词： Antibiotic Lanthanide Luminescence Metal-organic framework Sensor

Macro Meso Response and Stress Wave Propagation Characteristics of MCT High-Voltage Switch Under Shock load

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Defence Technology（防务技术） 2024年第2期32卷 317-335页

作者： Yuyang Guo Chuang Chen Ruizhi Wang Enling Tang Key laboratory of Transient Physical Mechanics and energy conversion materials of Liaoning Province Shenyang Ligong UniversityShenyang110159LiaoningChina

In order to study the dynamic and electrical coupling response characteristics of Metal Oxide Semiconductor Controlled Thyristor(MCT)high-voltage switch under the synergic action of mechanical load and high voltage,the separated Hopkinson pressure bar(SHPB)test system was used to simulate different impact load environments,and combined with the multi-layer high-voltage ceramic capacitor charging and discharging system,the instantaneous electrical signals of MCT high-voltage switch were *** with numerical simulation and theoretical analysis,the failure mode and stress wave propagation characteristics of MCT high voltage switch were *** mechanical and electrical coupling response characteristics and failure mechanism of MCT high voltage switch under dynamic load were revealed from macroscopic and microscopic *** results show that the damage modes of MCT high-voltage switches can be divided into non-functional damage,recoverable functional damage,non-recoverable damage and structural *** to the gap between the metal gate and the oxide layer,the insulating oxide layer was *** placing for a period of time,the elastic deformation of the metal gate partially recovered and the accumulated charge disappeared,which induced the recoverable functional damage failure of the *** addition,obvious cracks appeared on both sides of the monocrystalline silicon inside the MCT high-voltage switch,leading to unrecoverable damage of the device.

关键词： MCT Impact load Failure analysis Stress wave Numerical simulation

Flexible Crystal Heterojunctions of Low-Dimensional Organic Metal Halides Enabling Color-Tunable Space-Resolved Optical Waveguides

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Research 2024年第3期6卷 293-304页

作者： Yuhang Lin Shuya Liu Dongpeng Yan Beijing Key laboratory of energy conversion and Storage materials and Key Laboratory of RadiopharmaceuticalsMinistry of EducationCollege of ChemistryBeijing Normal UniversityBeijing 100875China.

Molecular luminescent materials with optical waveguide have wide application prospects in light-emitting diodes, sensors, and logic gates. However, the majority of traditional optical waveguide systems are based on brittle molecular crystals, which limited the fabrication, transportation, storage, and adaptation of flexible devices under diverse application situations. To date, the design and synthesis of photofunctional materials with high flexibility, novel optical waveguide, and multi-port color-tunable emission in the same solid-state system remain an open challenge. Here, we have constructed new types of zero-dimensional organic metal halides (Au-4-dimethylaminopyridine [DMAP] and In-DMAP) with a rarely high elasticity and rather low loss coefficients for optical waveguide. Theoretical calculations on the intermolecular interactions showed that the high elasticity of 2 molecular crystalline materials was original from their herringbone structure and slip plane. Based on one-dimensional flexible microrods of 2 crystals and the 2-dimensional microplate of the Mn-DMAP, heterojunctions with multi-color and space-resolved optical waveguides have been fabricated. The formation mechanism of heterojunctions is based on the surface selective growth on account of the low lattice mismatch ratio between contacting crystal planes. Therefore, this work describes the first attempt to the design of metal-halide-based crystal heterojunctions with high flexibility and optical waveguide, expanding the prospects of traditional luminescent materials for smart optical devices, such as logic gates and multiplexers.

关键词： waveguide Crystal elasticity

On-demand molecular design for efficient blue phosphorescence

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Science China Chemistry 2024年第7期67卷 2124-2126页

作者： Meiqi Dai Dongpeng Yan Beijing Key laboratory of energy conversion and Storage materials Key Laboratory of RadiopharmaceuticalsMinistry of EducationCollege of ChemistryBeijing Normal UniversityBeijing 100875China

Blue luminescence(including both fluorescence and phosphorescence)is one of the core elements in solid-state lighting and full-color *** to now,ultralong room temperature phosphorescence(RTP)with a long lifetime over 0.1 s has been continuously *** ultralong phosphorescence emission bands are in the region of 500 to600 ***,high-energy blue phosphorescence remains an immense challenge[1].

关键词： blue lifetime bands

Gold complex showing chiral persistent luminescence

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Science China materials 2024年第2期67卷 707-708页

作者： Tianhong Chen Dongpeng Yan Beijing Key laboratory of energy conversion and Storage materials and Key Laboratory of RadiopharmaceuticalsMinistry of EducationCollege of ChemistryBeijing Normal UniversityBeijing 100875China

Long-persistent luminescence(LPL)has received significant focus due to its exceptional applications in high-contrast molecular imaging,photodynamic therapy,data encryption and information storage,and among many others... 详细信息

关键词： luminescence showing exceptional

Coupling interface constructions of hollow Co-Mo mixed multiple oxidation states heterostructure for high-performance aprotic Li-O_(2) battery

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Nano Research 2024年第5期17卷 4100-4107页

作者： Xingzi Zheng Mengwei Yuan Jingshen Xu Zihan Li Caiyun Nan Genban Sun Beijing Key laboratory of energy conversion and Storage materials College of ChemistryBeijing Normal UniversityBeijing 100875China Center for Advanced materials Research Beijing Normal UniversityZhuhai 519087China

Constructing interfaces in heterostructures is effective for modulating the electronic properties of *** hollow CoMoO_(4)-Co_(3)O_(4) heterostructure(HCMCH)was prepared as a bifunctional electrocatalyst for Li-O_(2) *** different components in CoMoO_(4)-Co_(3)O_(4) heterostructure presented the efficient coupling and enhanced the electrocatalytic activity for aprotic oxygen reduction reaction(ORR)and oxygen evolution reaction(OER),in which it improved the obviously reduced overpotential of 300 mV(compared with the pure Ketjen black(KB)electrode),enhanced reversibility of 80%capacity retention after 6 full cycles and the superior cyclability of more than 200 cycles with an optimized *** battery performance of the HCMCH was not only associated with the unique hollow structure and rich active sites but also with coupling interface constructions synergetic effects attaching to the improving conductivity and optimized the discharge *** results suggested that this HCMCH electrocatalyst was a promising candidate for the Li-O_(2) battery and it gave a novel insight for high performance electrocatalyst designing.

关键词： Li-oxygen battery heterostructure electrocatalyst coupling interface

Low-cost dopant-free fluoranthene-based branched hole transporting materials for efficient and stable n-i-p perovskite solar cells

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Chinese Chemical Letters 2024年第10期35卷 213-219页

作者： Xinyu Yu Fei Wu Xianglang Sun Linna Zhu Baoyu Xia Zhong'an Li Key laboratory for Material Chemistry of energy conversion and Storage Ministry of Education Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Chongqing Key laboratory for Advanced materials and Technologies of Clean energy Faculty of Materials & Energy Southwest University

It has been widely recognized that hole transporting materials(HTMs) play a key role in the rapid progress of perovskite solar cells(PVSCs). However, common organic HTMs such as spiro-OMe TAD not only suffer from high synthetic costs, but also usually require the additional chemical doping process to improve their hole transport ability, which unfortunately induces the terrible stability issue. Therefore, it is urgent to develop low-cost dopant-free HTMs for efficient and stable PVSCs. In this work, we have successfully developed a new class of efficient dopant-free fluoranthene-based HTMs(TPF1–5) with quite low lab synthetic costs by combining donor-acceptor and branched structure designs. The detailed structure-property study revealed that tuning the twisted arms at different substitution sites would regulate the intermolecular interactions and film-forming ability, thereby significantly affecting the performance of the HTMs. By applying these HTMs in conventional PVSCs, the dopant-free TPF1-based devices not only achieved the best efficiency of 21.76%, which is comparable to that of the doped spiro-OMeTAD control devices, but also showed much better operational stability, which maintained over 87% of the initial efficiency under maximum power point tracking after 1038 h.

关键词： Dopant-free Fluoranthene Hole transporting materials Low-cost Perovskite solar cells

Multifunctional photon conversion materials for enhancing silicon solar cells

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Light(Science & Applications) 2024年第4期13卷 598-601页

作者： Yiyan Zhang Guanying Chen MIIT Key laboratory of Critical materials Technology for New energy conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of Technology150001 HarbinChina

A type of multifunctional erbium(Er^(3+))and ytterbium(Yb^(3+))codoped NaY(WO4)2 phosphors,with simultaneous photon upconversion,photon quantum cutting,and luminescence ratiometric temperature sensing abilities,have b... 详细信息

关键词： photon luminescence quantum