iScience
·
2023
·
IF 5.8
Jie Li,Junrong Zhang,Junwei Chu,Liu Yang,Xinxin Zhao,Yan Zhang,Tong Liu,Yang Lu,Cheng Chen,Xingang Hou,Long Fang,Yijun Xu,Junyong Wang,Kai Zhang
Summary As an elemental semiconductor, tellurium (Te) has been famous for its high hole-mobility, excellent ambient stability and topological states. Here, we realize the controllable synthesis of horizontal Te nanoribbon arrays (TRAs) with an angular interval of 60°on mica substrates by physical vapor deposition strategy. The growth of Te nanoribbons (TRs) is driven by two factors, where the intrinsic quasi-one-dimensional spiral chain structure promotes the elongation of their length; the epitaxy relationship between [110] direction of Te and [110] direction of mica facilitates the oriented growth and the expansion of their width. The bending of TRs which have not been reported is induced by grain boundary. Field-effect transistors based on TRs demonstrate high mobility and on/off ratio corresponding to 397 cm 2 V −1 s −1 and 1.5×10 5 , respectively. These phenomena supply an opportunity to deep insight into the vapor-transport synthesis of low-dimensional Te and explore its underlying application in monolithic integration.
研究领域:
材料科学
·
半导体物理
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 4
·2628-2632
·
IF 1.134
Gao Yuan,Wang Ka,Song Haizeng,Wu Han,Yan Shancheng,Xu Xin,Shi Yi
As a new topological insulator material, the β-phase silver telluride (Ag2Te) nanowire is a narrow bandgap semiconductor, which is attractive for its excellent properties. In this study, Ag2Te nanowires were synthesized by one-step hydrothermalmethod.
The nanowires showed good electrical properties with maximum drain-source voltage of 1.5 V, and the output current was up to 20 μA. The gate voltage has a significant effect on output current for the device. The Ag2Te nanowires will have more extensive and in-depth applications
in the fields of optoelectronics and thermoelectricity.
研究领域:
材料科学
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纳米技术
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电子工程
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DOI
PubMed
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 34
·15989-15997
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IF 7.233
Panpan Zhang,Fulai Zhao,Peng Long,Yu Wang,Yuchen Yue,Xuanyu Liu,Yiyu Feng,Rongjin Li,Wenping Hu,Yu Li,Wei Feng
We describe sonication-assisted liquid-phase exfoliation of rhombohedral germanium telluride (α-GeTe) to obtain a good dispersion of α-GeTe nanosheets in ethanol. The thickness of the α-GeTe nanosheets is dependent on the exfoliation conditions, and few-layer α-GeTe nanosheets of 2–4 layers and even monolayer α-GeTe were obtained. We use first-principles calculations to investigate the structural, electronic, and optical properties of monolayer and bulk α-GeTe and compare the optical band gap of centrifugally fractionated α-GeTe nanosheet dispersions with the computational predictions. We demonstrate that few layer α-GeTe nanosheets are purified selectively through centrifugation, and they exhibit high sensitivity to Fe3+. The scalable production of two-dimensional α-GeTe nanosheets can be used in the future optoelectronic industry.
研究领域:
材料科学
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化学
·
物理学
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DOI
PubMed
高影响因子
eScience
·
2023
·
IF 0
Mengjun Wang,Jun Jia,Hao Yan,Guang Li,Qiming Hong,Yuzheng Guo,Yong Xu,Xiaoqing Huang
Phase modulation of noble metal alloys (NMAs) is critically important in nanoscience since the distinct atomic arrangements can largely determine their physicochemical properties. However, the precise modulation of NMAs is formidably challenging, because thermodynamically stable phases are generally preferential compared to those metastable ones. Herein, we proposed a potential energy trapping strategy for phase modulation of Pd–Te alloys with solvents. Thereinto, ethylene glycol can increase the energy barrier for both Pd leaching and Te introduction, forming metastable Pd 20 Te 7 phase. Inversely, N, N-dimethylformamide is unable to trap metastable phase, inducing the phase evolution to thermodynamically stable PdTe phase, and the precise phase modulation was realized including Pd 20 Te 7 , PdTe and PdTe 2 phases. The Pd–Te alloys displayed phase-dependent formic acid oxidation catalytic performance with PdTe phase showing the best. This work proposes a strategy for creating metastable phase with potential energy trap, which may deepen the understanding of phase engineering for noble metal-based nanocrystals.
研究领域:
纳米科学
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材料化学
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物理化学
✓ 已验证
DOI
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2024
·Vol. 55
·期 2
·772-781
·
IF 2.4
Tian Qinghua,He Zhiqiang,Xu Zhipeng,Li Dong,Guo Xueyi
High-purity tellurium is a supporting material for contemporary high-tech industries. Zone refining is commonly used as a reliable final purification step to achieve higher purity levels of tellurium. However, the removal of Selenium (Se)—the most troublesome impurity in tellurium often occurring in quite high amounts—stays as the challenge during zone refining, due to its very unfavorable distribution coefficient. In addition, there is an important factor, essential to predict the zone refining efficiency (required number of passes), which is still seldom explored. Therefore, in the present work, the effect of different number of passes on the purification effect of tellurium was investigated by using 4N tellurium as raw material. Firstly, the possibility of removing vaporized Se through introducing an reductive gas flux was studied by testing initial concentrations of Se (13 ppm) and undergoing different process parameters. The experimental results showed that when the number of passes was 3, the impurity removal rate was low and the purification effect was poor; when the number of zone refining reached 9, the removal rate of most impurities in tellurium reached 100 pct, the removal rate of impurity Se reached 80.15 pct, and the total removal rate reached 89.49 pct, and the purity of tellurium ingot was 5N7.
研究领域:
材料科学
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冶金学
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半导体技术
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yiyang Chen,Jiawei Zhu,Ningxuan Xue,Xinyu Gai,Da Teng,Chen Wei,Fengling Liu,Zhaobing Guo,Yalin Yu,Pengxiang Qiu
Electrocatalytic reduction of nitrate (NO 3 - ) to ammonia (NH 3 ) provides a green and moderate alternative to the Haber-Bosch method. Yet, the NH 3 Faradaic efficiency (FE) is limited by the generation of byproducts and the occurrence of competitive hydrogen evolution reactions. The development of electrocatalysts for NO 3 - reduction to NH 3 with high activity and selectivity remains a significant challenge. Herein, we designed tellurides with electron-rich Ni sites grown on copper foam (Ni 3 Te 2 /Cu), which have been demonstrated to possess superior catalytic activity for electrochemical conversion of NO 3 - to NH 3 , with a maximum NO 3 - conversion rate of 100% and the FE was 96.78% at -0.49 V vs RHE and pH=7. The experimental results confirmed that the excellent NO 3 - reduction activity was attributed to the outstanding characteristic of tellurides and the formation of electron-rich Ni sites. Theoretical calculations further indicated that the tight binding of Cu and electron-rich Ni promotes NO 3 RR activity.
研究领域:
电化学
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催化材料
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL LETTERS
·
2025
·
IF 1.8
Feng Yang,Yonghai Yuan,Jiacai Li,Yihua Shi
This study presents a method for determining platinum group metals (Pt, Pd, and Rh, PGMs for short) in metallic catalysts using inductively coupled plasma–atomic emission spectrometry (ICP-AES) with coprecipitation separation and enrichment. The monolithic catalysts were initially digested using ultrasonic-assisted HCl dissolution followed by Na2O2 melting and filtration of the residue, overcoming the challenge of uniform grinding catalyst samples. Subsequently, coprecipitation with polyethylene oxide (PEO) and Te was employed to mitigate interferences from Si and other elements. ICP-AES was then used for the determination of PGMs. In this method, co-existing elements, such as 200 mg·L−1 of Te and 10 mg·L−1 of Fe, Cr, Ni, Al, and Na, exhibit no interference in the quantification of PGMs. The limits of detection (3s) were 0.04, 0.016, and 0.014 μg·g−1 for Pt, Pd, and Rh, respectively. The limits of quantification (10s) were 0.13, 0.053, and 0.046 μg·g−1 for Pt, Pd, and Rh, respectively. The relative standard deviations (RSD, n = 7) ranged from 1.36% to 2.61% for Pt, 1.14% to 3.25% for Pd, and 1.89% to 3.78% for Rh, indicating the method’s robustness and precision. Comparative analysis of the results obtained from six metallic catalyst products using this method and flame atomic absorption spectrometry (FAAS) reveals consistent results, further confirming the proposed method’s reliability and feasibility for determining PGMs in metallic substrate catalysts.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Materials
·
2024
·
IF 2.6
Yu Xianglei,Li Wei,Sun Hu,Qian Zhuo,Li Junpeng,Yu Yang,Gan Guoyou
The Te-based glass powder exhibits distinctive characteristics such as a low melting temperature and high chemical stability, rendering it a focal point of research in the realm of glass powder applications for solar cells. In this investigation, a pioneering Ge-containing Te-based lead-free glass powder was synthesized, and the influence of GeO2 content on critical parameters such as glass transition temperature (Tg), high-temperature fluidity, high-temperature wettability, acid and alkali resistance, as well as the network structure of the glass, was systematically explored. At an optimal GeO2 content of 8%, the glass powder displayed the lowest Tg (437°C), accompanied by a subdued crystallization reaction. The high-temperature fluidity and wettability exhibited favorable characteristics, indicating that the inclusion of GeO2 in the glass powder resulted in an enhanced interface contact. Building upon this foundation, techniques to augment the Ag+ content within the glass powder were investigated, along with the interaction between Ag+ and the SiNx anti-reflection layer or silicon on the surface of crystalline silicon solar cells. It was discerned that the Ag+ content in the glass powder significantly influences the deposition of silver microcrystals on the surface of crystalline silicon, thereby impacting the contact resistance of the solar cell. Then influences the series resistance and photoelectric conversion efficiency of the solar cell.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
Water Reuse
·
2024
·Vol. 14
·期 1
·39-50
·
IF 4.3
Huang Yiru,Li Youyou,Zhong Qingwei,Luo Chen
View large Download slide View large Download slide Close modal Metal-organic framework (MOF) materials, characterized by their porosity and large specific surface areas, exhibit excellent adsorption properties. With the aim of removing Te(IV) from environmental aquatic systems, this study is the first to propose the use of MIL-100(Fe). The material reveals a strong adsorption capacity for Te(IV), with maximum adsorption of 531.9 mg/g, superior to other adsorbent materials. Adsorption isotherm and kinetic models indicate that the adsorption process primarily involves monolayer chemical adsorption. According to the thermodynamic parameters, the adsorption reaction is endothermic. The experiment individually examined factors affecting the material's adsorption performance, including adsorbent dose, initial concentration of Te(IV), pH, adsorption time, and coexisting ions. Even under high ion strength conditions and high concentrations of coexisting ions, the material's adsorption efficiency for Te(IV) still reached over 94%. The material has been successfully applied to remove Te(IV) from lake water, river water, and seawater, yielding satisfactory results. Due to the high salinity and ionic strength of the solution, the removal efficiency of Te(IV) in the seawater matrix was slightly lower than that in freshwater (river and lake water). Thus, this material shows promise for the removal of Te(IV) from complex aquatic systems. MIL-100(Fe) was prepared and characterized. The Te(IV) can be adsorbed by MIL-100(Fe) effectively, and the adsorption process was primarily a monolayer chemical adsorption and an endothermic reaction. The Te(IV) can be removed effectively in environmental water supplies by MIL-100(Fe).
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Science Advances
·
2023
·Vol. 9
·期 17
·
IF 13.6
Chengyan Liu,Zhongwei Zhang,Ying Peng,Fucong Li,Lei Miao,Eiji Nishibori,Raju Chetty,Xiaobo Bai,Ruifan Si,Jie Gao,Xiaoyang Wang,Yanqiu Zhu,Nannan Wang,Haiqiao Wei,Takao Mori
By the fine manipulation of the exceptional long-range germanium-telluride (Ge─Te) bonding through charge transfer engineering, we have achieved exceptional thermoelectric (TE) and mechanical properties in lead-free GeTe. This chemical bonding mechanism along with a semiordered zigzag nanostructure generates a notable increase of the average zT to a record value of ~1.73 in the temperature range of 323 to 773 K with ultrahigh maximum zT ~ 2.7. In addition, we significantly enhanced the Vickers microhardness numbers (Hv) to an extraordinarily high value of 247 Hv and effectively eliminated the thermal expansion fluctuation at the phase transition, which was problematic for application, by the present charge transfer engineering process and concomitant formation of microstructures. We further fabricated a single-leg TE generator and obtained a conversion efficiency of ~13.4% at the temperature difference of 463 K on a commercial instrument, which is located at the pinnacle of TE conversion.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jinqian Zhang,Jun Liu,Yue Tian,Jiawen Guo,Wenjie Kong,Lizhen Long
Two-dimensional (2D) materials have emerged as promising candidates for photodetection applications, due to their unique structural and optical properties. Herein, we conducted a comprehensive investigation of the 2D Te-based photodetector. The crystal structure, angle-resolved polarized Raman (ARPR) spectroscopy, and theoretical analysis demonstrate the in-plane lattice anisotropy of Te, underlining its suitability for polarization-dependent photodetection. Photocurrent measurements over a broad spectral range (from 365 to 1310 nm) reveal excellent photoresponse characteristics, with responsivity ( R λ ) and detectivity ( D* ) values reaching up to 1189 A/W and 11.51 × 10 8 Jones, respectively, under 1064 nm illumination. Furthermore, the Te-based photodetector exhibits superior stability, retaining approximately 90 % of its initial performance after six months of ambient exposure. Polarization-sensitive photodetection experiments show significant dichroism ratios (up to 4.6 for 1064 nm illumination), emphasizing the potential of 2D Te for advanced polarization applications. The combination of the broad spectral response, high anisotropy ratio, and long-term stability positions 2D Te as a promising candidate for future photodetection technologies.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaobo Bai,Chengyan Liu,Fucong Li,Zhongwei Zhang,Ying Peng,Ruifan Si,Baoquan Feng,Guojing Wu,Jie Gao,Haiqiao Wei,Lei Miao
Lead-free GeTe-based thermoelectric (TE) materials are most promising candidates to replace the environmentally harmful PbTe for TE application at middle temperature range, where high power factor ( PF ) is significantly important for high power generation if the cost of heat source is low enough. In this study, we report for the first time that the PF of GeTe can be greatly enhanced by tailoring the interaction between Te 5s 2 lone pair and antibonding orbitals, which is induced by the hybridization of Zr 4d 2 electrons with antibonding orbitals. As a result, the contribution of Ge 4s 2 electrons to the valence band is promoted, leading to the band sharpening at the valence band maximum in rhombohedral phase, and simultaneous band sharpening at the valence band maximum and band flattening at the conduction band minimum in cubic phase. Lower band effective mass m b * effectively increases the carrier mobility to a very high value of ∼121 cm −2 V −1 s −1 (300 K), and the Seebeck coefficient is improved by the reduced detrimental effect of minority carrier in cubic phase, enhancing the maximum PF up to a record value of ∼5503 μW m −1 K −1 . With the assistance of reduced thermal conductivity, a peak zT of ∼1.9 is achieved at 673 K, which is one of the highest values among single doped GeTe. This work provides a new guidance to enhance the TE performance of GeTe-based materials.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
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