JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Wanying Wu,Mengmeng Lun,Zhifeng Xing,Hanzhao Song,Aihua Yao,Xunsheng Zhou,Zhong Wan,Kun-ming Gu,Sheng Yu,Qiliang Li,Yinzhen Wang,Wei Li,Guannan He,Benli Chu,Qinyu He
Te doped Yttrium-aluminum (Y 2 O 3 –Al 2 O 3 ) system powders were synthesized by solid-state method. The structure and optical properties were investigated by XRD , SEM, XPS and PL. XRD analysis indicated that the samples transform from YAM, YAP to YAG phase as the sintering temperature rises. The samples sintered below 1200 °C have a broad emission centered at 604 nm with a lifetime up to 13.33 μs under room temperature. While in the mix phase of YAP and YAG, a sharp and intense emission peak centered at 715 nm was monitored with a lifetime up to approximate 2.76 ms. Moreover, the band structure and density of states for Te doped YAGwere investigated by first-principle calculations.
研究领域:
材料科学
·
光学
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Zhiqi Li,Jiawen Yan,Qiming Li,Ao Xu,Jianchao Sun,Yijing Wang,Xiaoyu Zhang,Xueqin Sun,Fuyi Jiang,Yanli Zhou
MoSe2 with a two-dimensional layer-like structure has been considered a promising anode material for sodium-ion batteries (SIBs) on account of its high capacity and rich reserves on Earth. However, the inherent low conductivity of 2H-MoSe2, as well as the inevitable volume fluctuation during cycling, causes structural collapse and capacity decline, resulting in poor rate capability and unacceptable cycling stability. To improve the sodium storage properties of 2H-MoSe2, the Te doping strategy has been adopted to successfully synthesize Te doped 1T/2H-MoSe2 nanosheets (Te-MoSe2) via a facile two-step reaction. The Te doping induces the phase transition of 2H-MoSe2 to form 1T-MoSe2, which can improve the electron conductivity and generate more active sites, benefiting the promotion of sodium storage capacity. Besides, the 1T/2H heterogeneous interface accelerates the charge transfer kinetics. Thus, as an innovative anode material for sodium-ion half batteries, Te-MoSe2 exhibits better sodium storage performances than pure MoSe2. The full batteries composed of the Te-MoSe2 anode and Na3V2(PO4)3@rGO cathode also deliver remarkable electrochemical performances. The related kinetics results confirm the excellent electron transfer efficiency and rapid Na+ diffusion behavior of Te-MoSe2. Moreover, the reaction mechanism has also been elucidated by some ex situ characterization techniques. The good reversibility and excellent sodium storage properties of the Te-MoSe2 electrode indicate its potential application in future energy storage fields.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
Journal of Materials Chemistry C
·
2024
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IF 5.7
Junnan Wang,Zeyu Wang,Nikolai V. Gaponenko,Jindou Shi,Zheyuan Da,Chen Zhang,Yongqiang Ji,Qing Yao,Youlong Xu,Minqiang Wang
X-ray imaging technology has been integral to numerous aspects of people's lives since its inception. With the growing demand for advanced imaging technologies, lead-free metal halide perovskites have received significant attention due to their non-toxicity, stability, and excellent optical properties. This paper investigates the scintillation behaviour of a Te doped Cs2SnCl6 scintillator composite film (CF) prepared through an innovative in situ growth strategy. This approach achieves the direct growth of Cs2SnCl6:Te micro-crystals within polymethyl methacrylate (PMMA), mitigating the issues of optical property degradation and inhomogeneous distribution that are inevitable in a conventional two-step mixing method. By controllable optimization of the doping ratio of Te, the Cs2SnCl6:Te/PMMA CFs exhibited exceptional scintillation properties under X-ray irradiation, with the detection limit reaching up to 112 nGyairs−1. In X-ray imaging applications, the Cs2SnCl6:Te 15%/PMMA CF demonstrated advanced sensitivity, producing high-resolution structural images of the target object. This advancement highlights the promising potential of lead-free metal halide perovskites in the development and application of X-ray imaging technology.
研究领域:
材料科学
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医学影像
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光学
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DOI
高影响因子
ACS Nano
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2024
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IF 15.8
Lu Yu,Xiao-Lei Shi,Yuanqing Mao,Wei-Di Liu,Zhen Ji,Sitong Wei,Zipei Zhang,Weiyu Song,Shuqi Zheng,Zhi-Gang Chen
Incorporating donor doping into Mg3Sb1.5Bi0.5 to achieve n-type conductivity is one of the crucial strategies for performance enhancement. In pursuit of higher thermoelectric performance, we herein report co-doping with Te and Y to optimize the thermoelectric properties of Mg3Sb1.5Bi0.5, achieving a peak ZT exceeding 1.7 at 703 K in Y0.01Mg3.19Sb1.5Bi0.47Te0.03. Guided by first-principles calculations for compositional design, we find that Te-doping shifts the Fermi level into the conduction band, resulting in n-type semiconductor behavior, while Y-doping further shifts the Fermi level into the conduction band and reduces the bandgap, leading to enhanced thermoelectric performance with a power factor as high as >20 μW cm–1 K–2. Additionally, through detailed micro/nanostructure characterizations, we discover that Te and Y co-doping induces dense crystal and lattice defects, including local lattice distortions and strains caused by point defects, and densely distributed grain boundaries between nanocrystalline domains. These defects efficiently scatter phonons of various wavelengths, resulting in a low thermal conductivity of 0.83 W m–1 K–1 and ultimately achieving a high ZT. Furthermore, the dense lattice defects induced by co-doping can further strengthen the mechanical performance, which is crucial for its service in devices. This work provides guidance for the composition and structure design of thermoelectric materials.
研究领域:
材料科学
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物理学
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纳米技术
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DOI
高影响因子
MATERIALS LETTERS
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2018
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IF 2.687
Ying Lei,Wensheng Gao,Yu Li,Rundong Wan,Wen Chen,Rui Zheng,Leiqiang Ma,Hongwei Zhou
In the present wok, a series of Ti-filled and Te-doped skutterudite compounds Ti x Co 4 Sb 11.5 Te 0.5 (x = 0.2, 0.3, 0.5) were successful fabricated by combination of microwave synthesis and spark plasma sintering technique. The microstructure and thermoelectric properties of Ti x Co 4 Sb 11.5 Te 0.5 bulks have been investigated systematically. The experimental results show that nearly single phase skutterudite were obtained by 5 min microwave synthesis. The Ti 0.3 Co 4 Sb 11.5 Te 0.5 bulk has smallest and uniform grain size of about 2 μm. The influences of Ti concentration on thermoelectric properties were discussed. A highest ZT of 0.60 for Ti 0.3 Co 4 Sb 11.5 Te 0.5 was achieved at 773 K along with a total thermal conductivity of 3.72 W m −1 K −1 , one might obtain higher values at a higher temperature.
研究领域:
材料科学
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热电材料
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DOI
高影响因子
Chemistry-Switzerland
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2025
·Vol. 7
·期 5
·150
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IF 2.4
Ting Geng,Yuhan Qin,Zhuo Chen,Yuhan Sun,Ao Zhang,Mengyuan Lu,Mengzhen Lu,Siying Zhou,Yongguang Li,Guanjun Xiao
Lead-free perovskite variants have emerged as promising candidates due to their self-trapped exciton emission. However, in ASnX3systems, facile oxidation of Sn(II) to Sn(IV) yields A2SnCl6vacancy-ordered derivatives. Paradoxically, despite possessing a direct bandgap, these variants exhibit diminished photoluminescence (PL). Doping engineering thus becomes essential for precise optical tailoring of A2SnX6materials. Herein, through integrated first-principles calculations and spectroscopic analysis, we elucidate the luminescence mechanism in Te4+-doped (NH4)2SnCl6lead-free perovskites. Density functional theory, X-ray diffraction (XRD) patterns and X-ray photoelectron spectroscopy (XPS) confirm Te4+substitution at Sn sites via favorable chemical potentials. Spectral interrogations, including absorption and emission profiles, reveal that the intense emission originates from the triplet STE recombination (3P1→1S0) of Te centers. Temperature-dependent PL spectra further demonstrate strong electron–phonon coupling that induces symmetry-breaking distortions to stabilize STEs. Complementary electronic band structure and molecular orbital calculations unveil the underlying photophysical pathway. Leveraging these distinct thermal responses of PL intensity and peak position, 0.5%Te:(NH4)2SnCl6emerges as a highly promising candidate for non-contact, dual-parameter optical thermometry over an ultra-broad range (100–400 K). This work provides fundamental insights into the exciton dynamics and thermal engineering of optical properties in this material system, establishing its significant potential for advanced temperature-sensing applications.
研究领域:
材料科学
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凝聚态物理
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光学工程
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无机化学
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功能材料
✓ 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）