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.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Kai Wang,Ku-Han Deng,Yi-Shen Tian,Meng-Ying Sun,Zi-li Yu,Zhi-Quan Tian,Zhi-Ling Zhang
Fluorescence in the near infrared IIb window (NIR-IIb, 1500–1700 nm) shows higher signal-to-noise ratio, better space-time resolution, and deeper tissue penetration. However, materials with excellent fluorescence properties in the NIR-IIb region were rarely reported. Ag2Te quantum dots (QDs) could emit variable fluorescence in the NIR-II window due to their narrow band gap. Unfortunately, the fluorescence in the NIR-IIb region was not strong enough to image in vivo because the lattice defects on the surface of Ag2Te increased non-radiative transitions and decreased fluorescence performance. In this work, we coated a Ag2Te core with a Ag2Se shell to passivate the lattice defects and enhance its fluorescence efficiency. The fluorescence property of the as-prepared Ag2Te/Ag2Se core/shell QDs is more than 10 times stronger than that of Ag2Te. The brighter Ag2Te/Ag2Se QDs showed high-resolution in vivo imaging in the NIR-IIb region to distinguish thin blood vessels up to 66 μm. Overall, Ag2Te/Ag2Se QDs with excellent fluorescence in the NIR-IIb region were prepared and showed great potential for biomedical imaging.
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MATERIALS & DESIGN
·
2023
·
IF 8.4
Huyue Cao,Kaili Geng,Xinzhe Yan,Hangkai Qiu,Shan Lin,Chaoqing Dai,Wei Liu,Yueyue Wang
Tetracycline hydrochloride (TC-HCl) as an antibiotic is widely used in our daily life, but it has posed potential threats to the ecological environment for flowing into the natural environment. To address this issue, The photoelectrochemical (PEC) sensor is first developed for the detection of TC-HCl by comparing and analyzing ternary Bi 2 (Te 1-x Se x ) 3 nanomaterials prepared through different ratios of hydrothermal methods. Specifically, the Bi 2 (Te 1-x Se x ) 3 /Indium tin oxide (ITO) electrode can interact with TC-HCl rapidly and selectively which results in a significant reduction of the photocurrent signal. By regulating the ratio of x, it is found that Bi 2 Te 2.85 Se 0.15 /ITO have the best stability and the fastest response time in the detection of TC-HCl. The response/recovery speed of the sensor to TC-HCl is fast to 0.23 s, a low detection limit of 0.08 pmol/l (S/N = 3) and a linear detection fit of up to R 2 = 0.992. Moreover, the sensor has good stability and specificity for TC-HCL detection, providing a new perspective for the development of PEC sensors.
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MODERN PHYSICS LETTERS B
·
2023
·
IF 1.9
Yaqi Chen,Xin Fan,Shan Gao,Wenting Ji,Xinjian Li,Yuewen Zhang,Hongan Ma,Xiaopeng Jia
Electronegative S-filled skutterudite compounds have attracted considerable attention due to scattering of low-frequency phonons (35–50 cm − 1 ), but there are few reports on S-filled double-substituted skutterudite. In this work, a series of S-filled Te-Sn double-substituted skutterudite compounds were synthesized using high pressure and high temperature (HPHT) method. The phase composition, microstructure, and thermoelectric properties of S x Co 4 Sb 1 1 Te 0 . 7 Sn 0 . 3 ( x = 0 , 0.05, 0.10, 0.20) samples were systematically determined. The results show that the introduction of S increases the substitution limit of Te in the Sb site. Under the combined effect of the sample synthesis pressure and S filling, the nucleation density of the sample grains increases and the grain size decreases. At the same time, there are numerous special microstructures in the samples synthesized in a high-pressure environment. Thermoelectric performance studies show that a small amount of S filling optimizes the Seebeck coefficient of the sample and increases the power factor (PF). With an increase of the amount of S introduced, the thermal conductivity of the samples decreases significantly. Therefore, the maximum zT value of an S 0 . 0 5 Co 4 Sb 1 1 Te 0 . 7 Sn 0 . 3 sample synthesized at 2.5 GPa pressure is 0.17 at room temperature. The maximum zT value of the sample is 1.26 at 773 K.
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Materials Today Physics
·
2023
·
IF 11.5
Mengran Sun,Chunxiao Li,Jinlong Shi,Ming-Hsien Lee,Jiyong Yao
As promising candidate for mid- and far- infrared (MFIR) nonlinear optical (NLO) materials, diamond-like (DL) chalcogenides have been extensively studied because of their considerable advantages. Among them, tellurides attract our attention as their stronger electron polarization and wider transmittance range than those of sulfides and selenides . Herein, the insightful structural characteristics and NLO properties of defect DL MGa 2 Te 4 (M = Zn, Cd) were studied for the first time at experimental and theoretical level. They crystallize in the non-centrosymmetric I -4 space group (No.82), with a three-dimensional structure consisting of highly oriented [MTe 4 ] and [GaTe 4 ] tetrahedra, which can be viewed as derived from AgGaS 2 (AGS). Experimental results illustrate that MGa 2 Te 4 (M = Zn, Cd) exhibits moderate band gaps, strong SHG intensities about 4.9–10.6 times that of AGSe at 90–125 μm, and congruent-melting behavior. Theoretical calculations based on E-field DFPT method indicate that the tremendous SHG tensors d 14 of ZnGa 2 Te 4 and CdGa 2 Te 4 are 127.67 and 105.19 pm/V. SHG-density analysis reveals that the lone-pair packets of Te ions in [GaTe 4 ] units are the main source of SHG responses. In addition, calculations on Mulliken bond order index imply that the main difference between these two crystals is the bonding modes of M−Te. Special care was also given to ensure convergence of k -mesh for both conventional and primitive cells of the crystals, with two different methods for calculating linear and non-linear optical properties compared side by side. This work demonstrates the potential applications of these two defect DL tellurides in the MFIR NLO field .
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Materials Horizons
·
2023
·Vol. 11
·期 4
·1088-1097
·
IF 13.3
Shipeng Wang,Qiangchun Liu,Shikuo Li,Fangzhi Huang,Hui Zhang
Entropy engineering strategies provide a broader platform for exploring the behavior of electromagnetic wave (EMW) absorption materials and their absorption mechanisms on the microscopic scale. In this work, a novel entropy engineering strategy was developed to improve the EMW absorption properties of MoS2. A hierarchical N-doped carbon nanofiber/MoS2 (NCNF/MS) composite was synthesized using the electrospinning and hydrothermal methods. Then, the conformational entropy of MoS2 was increased by sequentially integrating elements such as W, Se, and Te. Although MoS2 maintains a single 2H-phase structure throughout the entropy increase process, it triggers a series of complex changes at the microscopic level, including lattice distortion, ingenious electronic structure adjustments, and an increase in defect density. These changes provide more possibilities for the EMW interaction with the absorber, which significantly enhances the dielectric behavior of the composites, including conduction and polarization losses. Owing to the unique hierarchical structure and rich defect structure, the obtained entropy-increased NCNF/MWSST exhibits excellent EMW absorption performance. The minimum reflection loss reaches −60.7 dB, and the maximum effective absorption bandwidth is 6.48 GHz, which is improved by almost 584% and 810% compared to NCNF/MS. This study provides a new way to design efficient and high-performance MoS2-based absorbers and provides valuable insights for exploring the entropy-increasing strategies to optimize the EMW absorption properties.
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Small
·
2023
·Vol. 19
·期 50
·2304504
·
IF 13.3
Honghai Wang,Wenyue Yang,Huiting Xu,Meng Li,Huibin Liu,Siqi Gong,Fan Zhao,Chunli Li,Junjie Qi,Wenchao Peng,Jiapeng Liu
Aqueous zinc-ion batteries (AZIBs) are considered to be one of the most promising devices for large-scale energy storage systems owing to their high theoretical capacity, environmental friendliness, and safety. However, the ionic intercalation or surface redox mechanisms in conventional cathode materials generally result in unsatisfactory capacities. Conversion-type aqueous zinc–tellurium (Zn–Te) batteries have recently gained widespread attention owing to their high theoretical specific capacities. However, it remains an enormous challenge to improve the slow kinetics of the aqueous Zn–Te batteries. Here, MoO 2 nanoclusters embedded in hierarchical nitrogen-doped carbon nanoflower (MoO 2 /NC) hosts are successfully synthesized and loaded with Te in aqueous Zn–Te batteries. Benefitting from the highly dispersed MoO 2 nanoclusters and hierarchical nanoflower structure with a large specific surface area, the electrochemical kinetics of the Te redox reaction are significantly improved. As a result, the Te-MoO 2 /NC electrode exhibits superior cycling stability and a high specific capacity of 493 mAh g −1 at 0.1 A g −1 . Meanwhile, the conversion mechanism is systematically explored using a variety of ex situ characterization methods. Therefore, this study provides a novel approach for enhancing the kinetics of the Te redox reaction in aqueous Zn–Te batteries.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 35
·18811-18819
·
IF 11.9
Qiang Zhang,Jiadang Li,Nagendra S. Chauhan,Lifei Wang,Zhicheng Huang,Wenhao Fan,Kei Hayashi,Shaoping Chen,Jianfeng Fan,Yuzuru Miyazaki
Grain boundary (GB) scattering has been widely reckoned as a primary restraint on room-temperature (RT) carrier mobility in Mg3Sb2-based materials. In this work, two-dimensional graphene (G) with varied contents was added to single phase Mg3.24Sb1.5Bi0.49Te0.01 materials in order to tailor the highly resistive space-charge region at GBs. The results indicate that introducing G effectively lowers the carrier transport energy barrier Eb from 42 meV (pristine sample) to 18 meV (Mg3.24Sb1.5Bi0.49Te0.01/1.0 vol% G sample), and correspondingly increases the drift mobility by 112.5% from 32 cm2 V−1 s−1 to 68 cm2 V−1 s−1 at RT, leading to an enhanced power factor and thus ZT value. Besides, first-principles calculations were also performed to qualitatively bridge the underlying negative correlation between the electronic density of states (DOS) and GB potential barrier Eb. Moreover, the equivalent nano-particle phonon scattering is also realized through introducing the two-dimensional G, contributing to a moderate reduction in lattice thermal conductivity as quantitatively illustrated based on the Debye–Callaway model. Consequently, the figure of merit ZT for G-added samples is greatly improved in the entire temperature range compared with that of the G-free sample. This study opens up a new avenue for rationally engineering the grain boundary, via regulating interfacial electronic DOS, to optimize electrical transport properties and ZT values.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Lisha Fan,Jiyong Tang,Ling Wu,Shuowen Zhang,Fan Liu,Jianhua Yao,Lianbo Guo
Bismuth telluride, (Bi 2 Te 3 ), is of great scientific and technical importance due to its excellent thermoelectric performance near room temperature. However, deposition of Bi 2 Te 3 thin films suffers from composition deviation due to preferential loss of Te at a high-temperature deposition environment. We demonstrated a fast and efficient laser annealing method to synthesize high-quality stoichiometric Bi 2 Te 3 thin films at room temperature from Te/Bi stacking films. The production rate of Bi 2 Te 3 was around 180 times higher than conventional thermal annealing. The formation of Bi 2 Te 3 thin films was studied with respect to annealing laser energy density . Bi 2 Te 3 thin films with an Bi:Te atomic ratio of 2:3 were achieved at an annealing laser energy density of 6.6 mJ/cm 2 . The structural, chemical, and thermoelectric performance of laser-annealed films were compared with conventional thermally annealed films. The Seebeck coefficient of laser-annealed films reached −167 µV/K, which was1.3 higher than that of thermally annealed films, evidencing the superiority of the laser annealing method in producing high quality Bi 2 Te 3 stochiometric films. Rapid growth of stoichiometric Bi 2 Te 3 thin films by laser annealing holds great promise for the development of high-performance thermoelectric devices.
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Small
·
2023
·Vol. 19
·期 45
·2303247
·
IF 13.3
Yuhe Bi,Sheng Cao,Peng Yu,Zhentao Du,Yunjun Wang,Jinju Zheng,Bingsuo Zou,Jialong Zhao
High color purity blue quantum dot light-emitting diodes (QLEDs) have great potential applications in the field of ultra-high-definition display. However, the realization of eco-friendly pure-blue QLEDs with a narrow emission linewidth for high color purity remains a significant challenge. Herein, a strategy for fabricating high color purity and efficient pure-blue QLEDs based on ZnSeTe/ZnSe/ZnS quantum dots (QDs) is presented. It is found that by finely controlling the internal ZnSe shell thickness of the QDs, the emission linewidth can be narrowed by reducing the exciton-longitudinal optical phonon coupling and trap states in the QDs. Additionally, the regulation of the QD shell thickness can suppress the Förster energy transfer between QDs in the QLED emission layer, which will help to reduce the emission linewidth of the device. As a result, the fabricated pure-blue (452 nm) ZnSeTe QLED with ultra-narrow electroluminescence linewidth (22 nm) exhibit high color purity with the Commission Internationale de l'Eclairage chromatic coordinates of (0.148, 0.042) and considerable external quantum efficiency (18%). This work provides a demonstration of the preparation of pure-blue eco-friendly QLEDs with both high color purity and efficiency, and it is believed that it will accelerate the application process of eco-friendly QLEDs in ultra-high-definition displays.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zhili Li,Jiye Zhang,Pengfei Luo,Jiayi Chen,Bowen Huang,Yuzhe Sun,Jun Luo
Silver chalcogenides demonstrate great potential as flexible thermoelectric materials due to their excellent ductility and tunable electrical and thermal transport properties. In this work, we report that the amorphous/crystalline phase ratio and thermoelectric properties of the Ag2SxTe1–x (x = 0.55–0.75) samples can be modified by altering the S content. The room-temperature power factor of the Ag2S0.55Te0.45 sample is 4.9 μW cm–1 K–2, and a higher power factor can be achieved by decreasing the carrier concentration as predicted by the single parabolic band model. The addition of a small amount of excessive Te into Ag2S0.55Te0.45 (Ag2S0.55Te0.45+y) not only enhances the power factor by decreasing the carrier concentration but also reduces the total thermal conductivity due to decreased electronic thermal conductivity. Owing to the effectively optimized carrier concentration, the thermoelectric power factor and dimensionless figure of merit zT of the sample with y = 0.007 reaches, respectively, 6.2 μW cm–1 K–2 and 0.39, while the excellent plastic deformability is well maintained, demonstrating its promising potential as a flexible thermoelectric material at room temperature.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xiaoyin Zhang,Jirun Zou,Xinkuo Zhang,Aixiang Wei,Ningqi luo,Zhen Liu,Jiaxiong Xu,Yu Zhao
Two-dimensional (2D) ReS 2 has received widespread attention because of its unique anisotropic properties, weak interlayer interactions and broad application prospects. Therefore, the controllable and repeatable growth of 2D ReS 2 flakes is very important for studying their properties and practical applications. In this work, 2D single-crystalline ReS 2 flakes with different layer numbers were synthesized on mica substrates using chemical vapor deposition (CVD) by adjusting the distance between the mica substrate and Re source, and the growth mechanism was further discussed. The fluorescence quenching effect and surface-enhanced Raman scattering (SERS) effect of 2D ReS 2 flakes were investigated using rhodamine B (RhB), crystal violet (CV) and malachite green (MG) dye molecules as Raman probes. The results show that the fluorescence quenching effect and SERS effect of 2D ReS 2 flakes are enhanced with decreasing layer number. The lowest detection limits on monolayer ReS 2 flake substrates are 10 −10 M, 10 −9 M and 10 −8 M for RhB, CV and MG under 532 nm laser excitation, respectively. 2D ReS 2 flakes used as a sensitive SERS-active substrate have excellent uniformity and stability. The surface Raman enhancement mechanism of 2D ReS 2 flakes was discussed.
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