Nanomaterials
·
2024
·Vol. 14
·期 8
·722
·
IF 4.4
Zhengtang Cai,Kaipeng Zheng,Chun Ma,Yu Fang,Yuyang Ma,Qinglin Deng,Han Li
Compared to SnTe and PbTe base materials, the GeTe matrix exhibits a relatively high Seebeck coefficient and power factor but has garnered significant attention due to its poor thermal transport performance and environmental characteristics. As a typical p-type IV–VI group thermoelectric material, W-doped GeTe material can bring additional enhancement to thermoelectric performance. In this study, the introduction of W, Ge1−xWxTe (x= 0, 0.002, 0.005, 0.007, 0.01, 0.03) resulted in the presence of high-valence state atoms, providing additional charge carriers, thereby elevating the material’s power factor to a maximum PFpeakof approximately 43 μW cm−1K−2, while slightly optimizing the Seebeck coefficient of the solid solution. Moreover, W doping can induce defects and promote slight rhombohedral distortion in the crystal structure of GeTe, further reducing the lattice thermal conductivityκlatto as low as approximately 0.14 W m−1K−1(x= 0.002 at 673 K), optimizing it to approximately 85% compared to the GeTe matrix. This led to the formation of a p-type multicomponent composite thermoelectric material with ultra-low thermal conductivity. Ultimately, W doping achieves the comprehensive enhancement of the thermoelectric performance of GeTe base materials, with the peak ZT value of sample Ge0.995W0.005Te reaching approximately 0.99 at 673 K, and the average ZT optimized to 0.76 in the high-temperature range of 573–723 K, representing an increase of approximately 17% compared to pristine GeTe within the same temperature range.
研究领域:
材料科学
·
能源材料
·
热电材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS
·
2025
·Vol. 25
·期 8
·2530
·
IF 3.5
Junting Zhang,Jiexin Chen,Shuojia Zheng,Da Zhang,Shaojuan Luo,Huixia Luo
HighlightsWhat are the main findings?A facile chemical strategy was developed for the synthesis of two-dimensional Te-doped GeH nanostructures with atomic-level precision and structural integrity.The Te-GeH-based photoelectrochemical (PEC) photodetectors exhibit high responsivity (708.5 µA/W) and ultrafast response speeds (92 ms rise/526 ms decay) under zero-bias conditions, demonstrating excellent broadband photoresponse.What is the implication of the main finding?The introduction of Te atoms enables effective modulation of the electronic structure in the GeH system. Owing to the comparable atomic radius between Te and Ge, efficient doping is achieved without disrupting the host lattice. In addition, the high electronegativity of Te induces electron redistribution and facilitates the formation of a built-in electric field, thereby optimizing charge separation and transport behavior. This approach provides a novel pathway for the functional design of Zintl-phase-derived two-dimensional materials, with broad implications for advanced optoelectronic applications.This doping strategy significantly enhances the photoelectrochemical performance of GeH-based photodetectors and enables the scalable fabrication of 2D nanomaterials with tunable optoelectronic properties. The resulting Te-GeH nanostructures offer improved carrier dynamics and reduced recombination, serving as a promising material platform for next-generation self-powered broadband photodetectors.Two-dimensional (2D) Xenes, including graphene where X represents C, Si, Ge, and Te, represent a groundbreaking class of materials renowned for their extraordinary electrical transport properties, robust photoresponse, and Quantum Spin Hall effects. With the growing interest in 2D materials, research on germanene-based systems remains relatively underexplored despite their potential for tailored optoelectronic functionalities. Herein, we demonstrate a facile and rapid chemical synthesis of tellurium-doped germanene hydride (Te-GeH) nanostructures (NSs), achieving precise atomic-scale control. The 2D Te-GeH NSs exhibit a broadband optical absorption spanning ultraviolet (UV) to visible light (VIS), which is a critical feature for multifunctional photodetection. Leveraging this property, we engineer photoelectrochemical (PEC) photodetectors via a simple drop-casting technique. The devices deliver excellent performance, including a high responsivity of 708.5 µA/W, ultrafast response speeds (92 ms rise, 526 ms decay), and a wide operational bandwidth. Remarkably, the detectors operate efficiently at zero-bias voltage, outperforming most existing 2D-material-based PEC systems, and function as self-powered broadband photodetectors. This work not only advances the understanding of germanene derivatives but also unlocks their potential for next-generation optoelectronics, such as energy-efficient sensors and adaptive optical networks.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 16
·1705833
·
IF 13.325
Zhongjian Xie,Chenyang Xing,Weichun Huang,Taojian Fan,Zhongjun Li,Jinlai Zhao,Yuanjiang Xiang,Zhinan Guo,Jianqing Li,Zhigang Yang,Biqing Dong,Junle Qu,Dianyuan Fan,Han Zhang
Nonlayered materials are constructed with chemical covalent bonds in all three dimensions, distinct from layered materials, which contain evident structural differences in the horizontal and vertical directions. As a consequence, liquid-phase exfoliation (LPE), a widely explored technique to obtain 2D layered nanoarchitectures, has not yet been fully characterized for the realization of 2D nonlayered nanostructures. Herein, by virtue of a typical chain-like structure of crystalline bulk Te with strong Te Te covalent bonds in intrachains and weak Van der Waals forces in interchains, ultrathin 2D nonlayered Te nanosheets are realized by means of an LPE method. The resultant 2D Te nanosheets possess a broad lateral dimension ranging from 41.5 to 177.5 nm and a thickness ranging from 5.1 to 6.4 nm, and its photoresponse properties are evaluated using photoelectrochemical measurements. The 2D Te nanosheets exhibit excellent photoresponse behaviors from the UV to the visible regime in association with strong time and cycle stability for the on/off switching behaviors. The fabrication approach of 2D Te nanosheets would arouse interest in exfoliating other nonlayered 2D materials, which would expand the family of 2D materials.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
PHYSICS LETTERS A
·
2019
·
IF 2.087
Manman Yang,Hongyu Zhu,Wencai Yi,Shangsheng Li,Meihua Hu,Qiang Hu,Baoli Du,Xiaobing Liu,Taichao Su
In this paper, p-type thermoelectric material Te–Se solid solutions have been successfully prepared by the high-pressure technique. The thermal conductivity of Te was depressed sharply by Se alloying. An extremely low thermal conductivity ∼0.27 W m −1 K −1 was obtained for Te alloyed with 15 mol% Se, which near the theoretical minimum, κ min . The bipolar diffusion effect of Te was suppressed by Se alloying due to the increased band gap, which lead to enhanced Seebeck coefficient and depressed bipolar diffusion thermal conductivity under high temperature. The maximum figure of merit, ZT of 0.37 at 480 K was obtained for Te alloyed with 5 mol% Se, which is about twice higher than that of pristine Te.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 105
·期 3
·1640-1647
·
IF 3.784
Bin Han,Qianhang Luo,Pengyu Zhang,Ting Zhang,Guowu Tang,Zhe Chen,Hang Zhang,Baoan Zhong,Yunhao Zeng,Min Sun,Qi Qian,Zhongmin Yang
In the field of multimaterial optical fibers, the demand for high-performance single-crystal core glass-clad multimaterial optical fibers is increasing. However, the applications of single-crystal fibers are restricted by the complex fabrication processes and the slow growth of single-crystal materials. Here, a two-step method is demonstrated to achieve single-crystal tellurium (Te) core fibers with high crystal quality over the length of the fiber. This method starts with the thermal drawing of a fiber preform into polycrystalline Te core multimaterial fibers (precursor fibers) that are long and mechanically stable. A 532-nm continuous laser is then employed to recrystallize the Te core in the precursor fiber into a single crystal state along the entire length of the fiber. Experimental studies of these single-crystal fibers demonstrate that the single-crystal Te core fibers possess high transmittance (>90% at 2–10 μm) and high thermoelectric performance (ZT values from 0.03 to 0.13 at 300 K temperature). They are superior to previous reports and our previous work. This method works for fabricating various single-crystal fibers and has important applications in the field of optical fibers, functional fibers, and their integrated devices.
研究领域:
光学
·
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
Optical Materials Express
·
2020
·Vol. 10
·期 4
·1072-1082
·
IF 3.064
Qianhang Luo,Guowu Tang,Guowu Tang,Guowu Tang,Min Sun,Min Sun,Guoquan Qian,Zhenguo Shi,Qi Qian,Qi Qian,Qi Qian,Qi Qian,Zhongmin Yang,Zhongmin Yang,Zhongmin Yang,Zhongmin Yang
Tellurium (Te) semiconductor core optical fibers with silicate glass cladding were drawn by the molten core method. The as-drawn precursor fiber has a large core diameter of about 123 µm, which was found to be polycrystalline. What is more, a Bridgman-type fiber postprocessing technique was constructed and used for the first time to anneal the polycrystalline Te semiconductor core optical fibers. The Te core in precursor fiber was melted and recrystallized to single crystal Te with c-axis orientation parallel to fiber axis, which was confirmed by X-ray diffraction, single crystal X-ray diffraction, micro-Raman spectra, and transmission electron microscope measurement results. Enhanced conductivities were observed in single crystal Te semiconductor core optical fibers under illuminated and stress states, respectively. This work demonstrates that the Bridgman-type fiber postprocessing technique could be an effective way to fabricate single crystal semiconductor core optical fibers with large core diameters (∼ 100 µm) and long lengths (a few centimeters).
研究领域:
材料科学
·
光学工程
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Energy
·
2020
·
IF 5.604
Tao Lu,Zhonghua Zhang,Bingbing Chen,Shanmu Dong,Chengdong Wang,Aobing Du,Longlong Wang,Jun Ma,Guanglei Cui
Magnesium batteries are recognized as a potential alternative to lithium ion batteries benefited from the advantages of low cost, high safety, and high energy density . But the development of magnesium batteries suffers from the sluggish motion of Mg 2+ in solid electrodes due to strong polarization. Compounds explored to accommodate magnesiation/demagnesiation, suffer from low capacity, sluggish kinetics and poor cycling performance. In this manuscript, copper current collector aided tellurium (Te) as the cathode material of magnesium battery is proposed. Due to superior electronic structure of Te atom, both reactants and products of cathode reaction exhibit metallic conductivity which accelerates the magnesiation/demagnesiation process This material delivers a specific capacity of 338 mAh/g at 100 mA/g, and keeps at 178.5 mAh/g after 400 cycles. Moreover, the electrode performs superior rate capability than the previously reported materials. A specific capacity of 265.4 mAh/g is achieved at 2 A/g without obvious polarization. Even at a very high current density of 3.75 A/g, a specific capacity of 118 mAh/g is still maintained. This study highlights the importance of electronic structure for multi-valent ion reaction related material, which also offers new strategy for cathode design of Mg batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
npj Quantum Materials
·
2023
·Vol. 8
·期 1
·1-7
·
IF 5.7
Xu R. Z.,Du X.,Zhou J. S.,Gu X.,Zhang Q. Q.,Li Y. D.,Zhao W. X.,Zheng F. W.,Arita M.,Shimada K.,Kim T. K.,Cacho C.,Guo Y. F.,Liu Z. K.,Chen Y. L.,Yang L. X.
TaTe 4 , a metallic charge-density wave (CDW) material discovered decades ago, has attracted renewed attention due to its rich interesting properties, such as pressure-induced superconductivity and candidate nontrivial topological phase. Here, using high-resolution angle-resolved photoemission spectroscopy and ab initio calculation, we systematically investigate the electronic structure of TaTe 4 . At 26 K, we observe a CDW gap as large as 290 meV, which persists up to 500 K. The CDW-modulated band structure shows a complex reconstruction that closely correlates with the lattice distortion. Inside the CDW gap, there exist highly dispersive energy bands contributing to the remnant Fermi surface and metallic behavior in the CDW state. Interestingly, our ab initio calculation reveals that the large CDW gap mainly opens in the electronic states with out-of-plane orbital components, while the in-gap metallic states originate from in-plane orbitals, suggesting an orbital texture that couples with the CDW order. Our results shed light on the interplay between electron, lattice, and orbital in quasi-one-dimensional CDW materials.
研究领域:
凝聚态物理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2021
·Vol. 647
·期 12
·1269-1276
·
IF 1.492
Jiayuan Zhang,Xiao Zhao,Yuandong Wu,Dajiang Mei,Shaoguo Wen,Thomas Doert
Two new antimony (III) tellurite sulfates [Sb 2 (TeO 4 )](SO 4 ) ( 1 ) and [Sb 2 (TeO 3 ) 2 ](SO 4 ) ( 2 ) were successfully synthesized through a conventional hydrothermal method and their crystal structures were determined by X-ray single crystal analysis. [Sb 2 (TeO 4 )](SO 4 ) crystallizes in the triclinic space group P ī (No. 2) with lattice parameters a=5.572(2), b=7.247(2), c=9.540(3) Å, V=358.5(2) Å 3 , and Z=2, while [Sb 2 (TeO 3 ) 2 ](SO 4 ) crystallizes in the orthorhombic space group Pbca (No. 61) with lattice parameters a=7.368(2), b=14.571(3), c=16.521(3) Å, V=1773.7(6) Å 3 , and Z=8. The structure of [Sb 2 (TeO 4 )](SO 4 ) features a three-dimensional framework, composed of [SbO 4 ] trigonal bipyramids and [TeO 4 ] polyhedra to form a cationic 2 ∞[Sb 2 (TeO 4 )] 2+ corrugated cationic layers along [100], linked by SO 4 2− anions. [Sb 2 (TeO 3 ) 2 ](SO 4 ) forms a three-dimensional framework consisting of two dimensional wrinkled layers of 2 ∞[Sb 2 (TeO 3 ) 2 ] 2+ that are linked by SO 4 2− anions. The band gaps of 4.16 eV and 3.72 eV for [Sb 2 (TeO 4 )](SO 4 ) and [Sb 2 (TeO 3 ) 2 ](SO 4 ) respectively are estimated from the solid state UV-vis-NIR diffuse reflectance spectra. Thermal analysis indicated that both compounds are thermally stable up to about 500 °C. The electrochemical specific capacity of [Sb 2 (TeO 4 )](SO 4 ) was determined to 245 mA h g −1 on the first cycle in a Li-ion half-cell, the capacity remains at about 106 mA h g −1 after 500 cycles.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Congwei Wang,Yongfeng Yuan,Weiwei Yan,Shenhui Shen,Min Zhu,Gaocan Cai,Bingxu Wang
For sodium-ion batteries, nickel telluride (NiTe 2 ) is an excellent anode material. However, significant volume changes and slow kinetics compromise its structural stability and its capacity for high-current reactions. To increase sodium storage performance, NiTe 2 nanoparticles are synthesized in situ within hollow porous carbon spheres (NiTe 2 @HPCS) through a “drop-dry” process, vacuum-assisted adsorption, and vapor tellurization. Then, a large number of NiTe 2 @HPCS particles are densely encapsulated in carbon fibers (CFs) via electrospinning and carbonization (NiTe 2 @HPCS/CF). In coin-type half cells, NiTe 2 @HPCS/CF exhibits a high and stable capacity of 432 mAh g −1 after 500 cycles at 1.0 A g −1 . When half cells are operated at 5.0 and 10.0 A g −1 , the lifespan reaches 1000 cycles and the capacities sustain at 332 and 195 mAh g −1 . The cycled electrode materials preserve the intact composite structure, demonstrating remarkable robustness. Kinetic investigation affirms swift electron and Na + conduction within NiTe 2 @HPCS/CF. Furthermore, in Na 3 V 2 (PO 4 ) 3 //NiTe 2 @HPCS/CF full cells, NiTe 2 @HPCS/CF also exhibits favorable cycling stability. At 1.0 and 5.0 A g −1 after 300 and 500 cycles, reversible capacities reach 299 and 172 mAh g −1 , respectively. The outstanding performance is associated with the unique dual carbon encapsulation structure: HPCSs effectively confine NiTe 2 nanoparticles, maintaining their high electrochemical activity and promoting the sodiation/de-sodiation reactions. CFs further reinforce structural stability and electron conduction of NiTe 2 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID STATE SCIENCES
·
2025
·
IF 3.3
Zhiwei Jiao,Aolong Sun,Xufang Zhang,Mulan Mu,Haoran Dong
Black phosphorus (BP) has attracted much attention for its excellent electrical and optical properties and its potential in field-effect transistors (FETs). In this work, BP doped with oxygen group elements (sulfur, selenium, and tellurium) was successfully synthesized using the chemical vapor transport method (CVT), and their optoelectronic properties were studied systematically. It is confirmed by X-ray diffraction (XRD) that BP crystals doped with the oxygen group elements exhibited high crystalline quality and yield. Changes in the absorption spectra and surface morphology indicated that doped BP demonstrated significantly enhanced environmental stability compared to undoped BP under prolonged air exposure. Among the doped samples, tellurium (Te)-doped BP showed the highest stability, with a degradation rate of only 9.91 % after 10 days. FETs based on doped BP were successfully fabricated, and their electrical performances were thoroughly evaluated. We found that the hole mobility of BP was dramatically improved by doping, and the selenium (Se)-doped BP possessed the highest hole mobility of 1684.24 cm 2 /V·s.
研究领域:
材料科学
·
光学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 10
·期 1
·150-159
·
IF 7.393
Mengran Sun,Xingyu Zhang,Chunxiao Li,Wenhao Liu,Zheshuai Lin,Jiyong Yao
The hybrid anion strategy has been illustrated to be an effective way to design and synthesize high-performance nonlinear optical (NLO) crystals. Herein, a new NLO-active oxytelluride with a highly polarized [GeOTe3] unit, Ba3Ge2O4Te3, has been successfully synthesized. Driven by the distorted [GeOTe3] motif, this compound exhibits interesting structural order promotion with its parent model Ba2ZnGe2O7 (BZGO). Moreover, on the basis of inheriting the polarization structure of BZGO, the Ba3Ge2O4Te crystal possesses an enhanced second harmonic generation (SHG) response benefiting from the partial replacement of O with the more polarized Te. Remarkably, the experimental results and theoretical calculations reveal that Ba3Ge2O4Te3 has the potential to be a promising infrared (IR) NLO material, encompassing a strong SHG response with good phase matchability, wide band gap, high laser damage threshold (LDT), and large birefringence of 0.14@2.09 μm (5.7× AGSe, 10× BZGO) which overcomes the drawback of the small birefringence of AGSe. This work demonstrates that a highly polarized [GeOTe3] motif can be used as a new basic building block (BBB) for IR NLO materials, providing a new idea for the exploration of new functional oxytellurides.
研究领域:
材料科学
·
晶体学
✓ 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）