ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 45
·2207688
·
IF 19.924
Peng Wan,Mingming Jiang,Longxing Su,Sihao Xia,Yun Wei,Tong Xu,Yang Liu,Daning Shi,Xiaosheng Fang,Caixia Kan
Low-dimensional polarization-sensitive photodetectors have captured ever-increasing attention due to their unique applications in navigation, optical switching, and communication. However, to date, the study of dimensionality-dependent polarization-sensitive photodetectors has not received much attention. Herein, a double-faced polarization-sensitive photodetector based on an individual high-quality Sb 2 Se 3 microbelt is proposed, where both the wide and narrow side facets serve as irradiation targets. Polarization-sensitive measurements reveal the anisotropy in the photocurrents recorded parallel and perpendicular to the long axis of the Sb 2 Se 3 microbelt. Strikingly, the single Sb 2 Se 3 microbelt photodetector reveals the obvious perpendicular reversal with a 90° angle on polarization sensitivity from the wide surface to the narrow surface. With decreasing inclination angle, the anisotropic ratio varies from 1.18 to 0.87 gradually. Interestingly, the photodetector can lose its polarization sensitivity at a particular inclination angle. Angle-resolved polarized Raman spectroscopy confirms the asymmetry and anisotropic character of the Sb 2 Se 3 microbelt. The polarization sensitivity of the Sb 2 Se 3 microbelt photodetectors originates from the optical anisotropy induced by the crystal structure anisotropy, rather than one-dimensional geometry morphological anisotropy. The use of an anisotropic Sb 2 Se 3 microbelt in double-faced polarization-sensitive photodetection may contribute to new functionality in innovative optoelectronic applications.
研究领域:
光电子学
·
凝聚态物理
·
纳米材料科学
·
光学传感
·
半导体器件
✓ 已验证
DOI
高影响因子
LIQUID CRYSTALS
·
2023
·
IF 2.2
Tong Zhang,Fanghua Liang,Xurui Li,Hongfei Lin,Ran Chen,Pei Chen,Xinbing Chen,Zhongwei An
A series of new liquid crystal compounds with negative dielectric anisotropy was synthesised by regulating the orientation of the substituents on the benzoxazole ring, namely, 5–4-(2-(4-(alkoxy)phenyl)-2,3-difluorophenyl)benzo[d]oxazole derivatives (nPP(2,3)FO). These compounds mainly display enantiotropic nematic mesophases in the ranges of 8.62–16.09°C (heating process) and 23.98–30.32°C (cooling process), moderate birefringence (Δn) ranging from 0.25–0.32 (DFT theoretical calculation) and 0.22–0.28 (experimental measurement), as well as negative dielectric anisotropy (Δɛ) ranging from −2.77 to −2.94. These characterises are ascribed to the larger perpendicular dipole moments and orientation angles of benzoxazole. This work provides new ideas for the rational design of negative dielectric anisotropy liquid crystals.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
LIQUID CRYSTALS
·
2016
·
IF 2.244
Ran Chen,Zhongwei An,Feng Li,Xinbing Chen,Pei Chen
Four series of tolane liquid crystals containing 2,3-difluorophenylene and terminated by a tetrahydropyran (THP) moiety have been synthesised via multistep reactions based on 4-alkylcyclohexanecarboxylic acids and 4-bromo-2,3-difluorophenol. Their properties were measured by differential scanning calorimetry, polarising optical microscopy, Abbe refractometer and an electrical constants instrument. The results show that the THP-based liquid crystals nT reveal a relatively high value of the birefringence, negative dielectric anisotropy, good solubility and a broad nematic mesophase. The effects of the terminal alkyl chain, the lateral fluoro substituents and the THP terminal group on the mesomorphic and physical properties are discussed. Meanwhile, density functional theory calculations of molecular conformation and polarisability were conducted to correlate the experimental findings.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Jinxie Yu,Xiao Liu,Yumeng Jia,Hang Han,Xiaoli Liu,Hai Shan,Zhiqiang Li,Qingqing Xiong
Herein, we report the construction of hybrid hydrogels possessing mechanical anisotropy as well as luminescent anisotropy via the copolymerization of superparamagnetic nanoparticle-coated halloysite nanotubes (Fe/HNTs), a lanthanide complex, and acrylamide in a directed magnetic field. The aligned one-dimensional (1D) Fe/HNTs reinforce the polymer network in an anisotropic manner, thus leading to mechanical anisotropy. Meanwhile, the orientation-dependent shading effect of the aligned Fe/HNTs on the lanthanide emitting centers endows the hydrogels luminescent anisotropy. Notably, both the mechanical anisotropic parameter and luminescent anisotropic parameter (tensile, compressional, rheological, and emission anisotropic parameters are 4.8, 5.3, 4.9, and 5.5, respectively) of the hybrid hydrogels are significantly higher than those prepared using ferromagnetic 2D nanofillers. This work proposes a promising strategy to design mechanical/luminescent dual anisotropic soft materials with a high anisotropic parameter.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Songrong Cheng,Men Shao,Ke Wang,Peilun Shen,Hao Duan,Lu Li,Baokang Hou,Xin You,Huaming Deng,Kaizhao Wang,Jin Hu,Rui Chen,Qingming Chen,Sheng'an Yang,Ji Ma
Polycrystalline La 0.67 Ca 0.33 MnO 3 films were fabricated by spin–coating, exhibiting strong structural anisotropy, along with excellent anisotropic magnetoresistance (AMR) and temperature coefficient of magnetoresistance (TCM) properties. These films show potential as materials for angle sensors in consumer electronics. The crystallinity and interface matching of La 0.67 Ca 0.33 MnO 3 films are closely linked to sintering conditions. Enhanced crystallization promotes better grain orientation, grain boundary connectivity, and lattice anisotropy, ultimately leading to improved physical properties. That is, the optimized sintering temperature of 1100 °C led to best grain boundary connectivity, resulting in −19.8 % AMR at 1T and 26.7 % TCM at 0.1T near room temperature (≈270 K). A comparative analysis of temperature, magnetic field, and performance demonstrates that the sample achieves the best AMR performance (0–1 T magnetic field, response temperature close to room temperature) compared to existing literatures. Additionally, significant magnetic anisotropy was observed, with the magnetic susceptibility anisotropy enhanced by a factor of three near the Curie temperature. Curie–Weiss fitting showed that films with optimal crystallinity exhibited significant differences between the in–plane and out–of–plane effective magnetic moments, while films with poorer crystallinity showed minimal differences, indicating that structural anisotropy underlies the anisotropy in magnetic properties.
研究领域:
材料科学
·
凝聚态物理
·
薄膜技术
·
磁阻效应
·
自旋电子学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 37
·2400549
·
IF 13
Yaoguo Shen,Mingliang Ding,Gang Chen,Yingjie Luo,Sangen Zhao,Junhua Luo
A large optical anisotropy is the most important parameter of birefringent crystals. Integrating π-conjugated groups with large polarizable anisotropy into target compounds is a common strategy for constructing brilliant birefringent crystals. However, the key problem is to enhance the density of the birefringence-active units and further arrange them parallelly. In this study, three novel birefringent crystals, C 9 H 7 NBrX (X = Cl, Br, NO 3 ), are successfully synthesized by introducing a new birefringence-active [C 9 H 7 NBr] + unit. Interestingly, these compounds feature similar layered structures but exhibit different optical anisotropies at 550 nm (0.277 for C 9 H 7 NBrCl, 0.328 for C 9 H 7 NBrBr, and 0.401 for C 9 H 7 NBrNO 3 ) owing to the different anions in them. Particularly, the small trigonal planar NO 3 anions perfectly fill the interstices of the π-conjugated [C 9 H 7 NBr] + groups with large optical anisotropy, with the resulting compound C 9 H 7 NBrNO 3 showing superior optical properties compared to the others. The above findings provide strategies for designing new optical materials with large birefringence by matching birefringence-active groups of different sizes. Additionally, a new theory for predicting and comparing the polarizability anisotropy of compounds is proposed, which would guide in exploring large birefringent crystals.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·
IF 4.1
Luo Fang-Hua,Dong Zhi-Tao,Chen Guo-Hua,Ma Chen,Wang Huai-Yuan
Janus films with asymmetric physical/chemical properties have attracted considerable attention due to their promising applications in personal thermal management, electronic skins, sensors, actuators, etc. However, traditional methods for fabricating Janus films conventionally need the assistance of an interface or auxiliary equipment, which are usually complex and time-consuming. Herein, flexible poly(vinyl alcohol) (PVA)/graphene oxide (GO)/h-BN (recorded as PVA/GO/h-BN) Janus films with thermally, optically, and electrically anisotropic properties are fabricated by a simple density deposition self-assembly method, which just utilizes the density difference between GO and h-BN during water evaporation. Experimental results show that the two sides of the acquired Janus films have obvious asymmetric characteristics. In the original state of the PVA/GO/h-BN Janus films, the thermal conductivity of the GO side (10.06 W·m −1 ·K −1 ) is generally lower than that of the h-BN side (10.48 W·m −1 ·K −1 ). But after GO is reduced, the thermal conductivity of the rGO side reaches 12.17 W·m −1 ·K −1 , surpassing that of the h-BN side. In addition, the relative reflectance of the h-BN side of Janus film is also significantly higher than that of the rGO side, and the surface resistance difference between the two sides is about 4 orders of magnitude. The prepared PVA/GO/h-BN Janus films show great application potential in human thermal management, light conversion switches, and electronic skins. This study provides a simple and versatile strategy for fabricating Janus films with multifunctional (such as thermal, optical, and electrical) anisotropies.
研究领域:
材料科学
·
纳米技术
·
热管理材料
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2023
·
IF 4.5
Guizhen Yu,Qingyu Niu,Xiao Liu,Liang He,Jinxie Yu,Hang Han,Wenjing Wang,Ying Zhang,Zhiqiang Li,Qingqing Xiong
In this work, hybrid anisotropic hydrogel is developed through dispersing carbon quantum dots , ultrahigh magnetic nanoparticle-coated alumina (Fe/Al 2 O 3 ) platelets in acrylamide aqueous solution in the assistance of magnetic field, then fix the oriented structure via gelation . The aligned Fe/Al 2 O 3 platelets result in formation of anisotropic structure, thus endows the hydrogels mechanical anisotropy and fluorescent anisotropy. White-light emission is obtained via varying the weight ratio of yellow-emitting ZnO QDs and blue-emitting N,S-CDs. This strategy not only enriches the mechanical/fluorescent dual anisotropic soft materials, but also have great potential application in the fields of organic light-emitting diodes, nonlinear optics and field effect transistors .
研究领域:
材料科学
·
光电技术
·
纳米技术
·
软物质物理
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2021
·Vol. 18
·期 5
·2104460
·
IF 13.281
Yanan Huang,Jianguo Si,Shuai Lin,Hongyan Lv,Wenhai Song,Ranran Zhang,Xuan Luo,Wenjian Lu,Xuebin Zhu,Yuping Sun
3D anisotropic functional properties (such as magnetic, electrical, thermal, and optical properties, etc.) in a single material are not only beneficial to the multipurpose of a material, but also helpful to enrich the regulatory dimensionality of functional materials. Herein, a colossal 3D electrical anisotropy of layered MAB-phase MoAlB single crystal is introduced and dissected. Using high-temperature metal-solution method, high-quality MoAlB single crystals are obtained and a surprisingly strong out-of-plane ( σ a / σ b = 1.43 × 10 5 , at 2 K) and in-plane ( σ a / σ c = 12.12, at 2 K) electrical anisotropies are first observed. After a series of experimental and theoretical investigations, it is demonstrated that the 3D anisotropic crystal structure and chemical bond of MoAlB result in its 3D anisotropic phonon vibration and electronic structure, influence the corresponding electron-electron as well as electron-phonon interactions, and finally give rise to its colossal 3D anisotropy of electrical conductivity. This work experimentally and theoretically proves MoAlB single crystal possessing the 3D anisotropies of crystal structure, chemical bond, phonon vibration, electronic structure, and electrical transport, but also provides a promising platform for the future design of functionalized electronic devices as well as synthesis of new and large-sized in-plane anisotropic 2D material (MoBene).
研究领域:
凝聚态物理
·
材料科学
·
功能材料
·
晶体化学
·
纳米电子学
·
低维材料
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2017
·
IF 2.084
Jianxu Ding,Songjie Du,Xiaohua Cheng,Lin Jing,Ying Zhao,Zhiyuan Zuo,Hongzhi Cui,Xiaoyuan Zhan
Organic-inorganic hybrid methylammonium lead iodide perovskite (MAPbI 3 ) is considered as new generation optoelectronic material. MAPbI 3 single crystal is proved more excellent than its polycrystalline film and nano state counterparts, though the discrepancy is still pending. Referring MAPbI 3 single crystal applications, physical anisotropy stands in its breach. However, it has not been drawn enough attentions till now. In this study, taking advantages of the natural exposed (100) and (112) facets of MAPbI 3 single crystal grown from γ-butyrolactone (GBL) solution, the anisotropic optoelectronic performances based on of these two lattice planes were systematically explored through planar metal-semiconductor-metal (MSM) devices. An order enhanced photocurrents , 135% increased responsivity, and 128% heightened EQE on (112) plane device than those on (100) plane device under 5 V bias with irradiation power of 1 mW, remarkably demonstrated that (112) plane was more excellent in optoelectronic performances and light harvesting capability.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Bei Jiang,Meilin Li,Shuoang Cao,Zining Wang,Lijun Huang,Xinyi Song,Yuanqiao Zhang,Quanping Yuan
In order to increase the number and contact probability of electric dipole on cellulose, acid and alkali treatment was employed to extract hemicellulose and lignin from original wood to gain a highly oriented cellulose frame. The combined means with 2,2,6,6-tetramethylpiperidine-1-oxyl–NaBr–NaClO oxidation and impregnation of PDMS with compression was subsequently used to enhance its mechanical performance and electromechanical conversion. The assembled wooden electromechanical device (10 mm × 10 mm × 1 mm) exhibits the maximum open-circuit voltage (VOC) of 11.75 V and short-circuit current (ISC) of 211.01 nA as stepped by foot. It can be sliced to fabricate a flexible sensor with high sensitivity displaying VOC of 2.88 V and ISC of 210.09 nA under the tapped state. Its highly oriented wood fiber makes it display significant anisotropy in terms of mechanical and electromechanical performance for multidirectional sense. This strategy will exactly provide reference for developing other high-performance piezoelectric devices.
研究领域:
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 57
·46301-46306
·
IF 3.84
Jing Fang Guo,Rong Mei Fang,Cheng Zhi Huang,Yuan Fang Li
In order to eliminate the scattered light induced by the signal amplifier in fluorescence anisotropy (FA) assays, a nanosized metal–organic framework MIL-101, ranging from 80–500 nm, has been synthesized through a hydrothermal method with the addition of glycerol. We chose the 100 nm MIL-101 to enhance FA for label-free detection of the respiratory syncytial virus (RSV) gene sequence and the DNA-intercalating dye SYBR Green I (SGI) as the fluorophore, based on the different affinities of MIL-101 toward ssDNA and dsDNA. The nanosized MIL-101 has a negligible scattering effect owing to its smaller particle size, so all of the experimental data of FA values were smaller than the maximum initial anisotropy of 0.4. As a specific advantage, a dual amplification result of not only an increase in the FA value of SGI/ssDNA (r1) but also a decrease in the FA value of SGI/dsDNA (r2) was presented at the same time. Consequently, a larger FA value change Δr (Δr, Δr = r1 − r2) was obtained and contributed to improve the sensitivity. In addition, the quantitative detection of the target DNA (T) was achieved according to the relationship between Δr and the concentration of T. In the presence of MIL-101, the Δr is 7-fold higher than that without MIL-101 and achieved the sensitive and selective detection of RSV DNA.
研究领域:
生物化学
·
分析化学
·
病毒学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）