JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 36
·期 1
·1-8
·
IF 2.8
Shan Zhang,Xin Song,Xing Gao,Chunxiao Lu,Pei Han,Yunying Liu,Xiaowei Li,Junyan Zhang,Yong Li
The ferroelectric photovoltaic (PE-PV) effect has been extensively explored and plays a crucial role in constructing self-powered photodetectors. Ferroelectric materials have been attracting great interest in self-powered ultraviolet (UV) photodetectors due to their polarization-induced photovoltaic effect. In this paper, the ultraviolet self-powered photodetection properties of polycrystalline rare-earth Yb 1-x Ho x MnO 3 (0 ≤ x ≤ 0.08, Δx = 0.02) ferroelectric materials have been investigated. The substitution of Ho atoms for Mn atoms has a great influence on the ferroelectric polarization, and Ho doping increases the photocurrent density. The photodetectors show excellent reproducibility responsivity (R) and detectivity (D*) under illumination at 365 nm. In addition, at the light density of 1 mW/cm 2 , the responsivity and detectivity of the photodetectors are as high as 0.09 W/A and 3.359 × 10 11 Jones, respectively. These outstanding photodetection performances are due to the relatively high short-circuit current density ( J sc ). High J sc implies that more photogenerated carriers can be produced under illumination, which makes the device more sensitive to optical signals. This study presents a feasible method for improving the light-detection performance of the ultraviolet self-powered detector.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Hairus Abdullah,Noto Susanto Gultom,Hardy Shuwanto,Worku Lakew Kebede,Dong-Hau Kuo
Zn(O,S) has been successfully doped with different amounts of Ho and characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), and transient photocurrent (TPC). The as-prepared Ho-doped Zn(O,S) catalysts with different Ho amounts are evaluated for hydrogen evolution reaction. The catalyst with the best performance in evolving hydrogen is further utilized to hydrogenate 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). It is found that doping with Ho obviously enhanced charge transfer and photoresponse properties of the catalyst. Therefore, the modified Zn(O,S) can optimally evolve hydrogen by 18 624 μmol/g, which is 20% higher than that of pristine Zn(O,S). Subsequently, the in situ generated hydrogen ions on catalyst surfaces also play an important role as a hydrogen source to hydrogenate 4-NP to 4-AP without any reducing agents such as NaBH4, which is commonly used as a hydrogen source. As Ho is doped in the lattices of Zn(O,S), it acts not only to separate photocarriers and to enhance the charge transfer but also to shorten the diffusion time of nitrophenolate ions to catalyst surfaces for further photocatalytic hydrogenation reaction (PHR) process. A plausible PHR mechanism has been provided to elucidate the great performance of Ho-modified Zn(O,S) for photocatalytic hydrogenation.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Yuankai Hao,Xiuwei Fu,Xianhui Xin,Xianxian Yang,Zhen Zhang,Zhitai Jia,Xutang Tao
In this work, a novel Ho-doped Tb 3 Sc 2 Al 3 O 12 magneto-optical single crystal has been successfully grown by the Czochralski method for the first time. Phase composition of the crystal was tested by XRD measurements. The distribution coefficient of Ho 3+ in the crystal was obtained. The crystal exhibits excellent optical transmittance without inclusions. It shows a uniform elemental distribution and excellent magneto-optical properties. The Verdet constant is comparable to Tb 3 Sc 2 Al 3 O 12 crystal and higher than that of traditional Tb 3 Ga 5 O 12 crystal. Therefore, the Ho-doped Tb 3 Sc 2 Al 3 O 12 single crystal is a promising material for visible near-infrared Faraday applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Xiya Wang,Zhaoguo Zhang,Zhengfeng Huang,Peimei Dong,Xiaoxiao Nie,Zhi Jin,Xiwen Zhang
The photoreduction of CO 2 by using Ho and N co-doped TiO 2 was explored. The doping elements can further improve the separation efficiency of photogenerated electron-hole pairs via refining grains, causing lattice distortion and adsorbing more hydroxyl radicals(·OH). We found that there exists product selectivity such that the photoreduction products of Ho/N-TiO 2 mainly consist of CO and methanol, while the counterparts of pristine TiO 2 are CO and methane. The possible mechanism of CO 2 reduction is depicted involving the generation and combination of specific radicals. Thus, the amount of ·OH adsorbed on the surface of the catalyst makes a significant difference in the selectivity in the reduction products. Ho/N-TiO 2 catalyst with the synergic effect of Ho and N showed the best photoreductive performance for CO 2 with H 2 O to CO and CH 4 , and its formation rate of CH 4 was 29 μmol/gcatal./hour.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2014
·Vol. 50
·期 6
·2480-2490
·
IF 2.305
Wei T.,Ye L.,Zhao C. Z.,Wang W. B.,Ma Q. Z.,Lv Q.,Liu J. M.
Filled tetragonal tungsten bronze (FTTB) oxides represent a huge family of materials which exhibit rich electric and magnetic functionalities deserving for comprehensive investigations. Recently, some members of this family have established their significance in efficient upconversion (UC) luminescence upon proper rare-earth species doping, while the signal intensity is yet weak. In this work, the UC luminescence of Ba
p
Ln 6− p
Ti 8− p
Nb 2+ p
O 30 codoped by Ho and Yb (BLTN p :Ho–Yb) with different p are studied. The bright UC green emission, red emission, and near-infrared (NIR) emissions, originating from the two-photon energy-transfer process associated with the 5 S 2 → 5 I 8 , 5 F 5 → 5 I 8 , and 5 S 2 → 5 I 7 transitions of Ho 3+ ions, were observed. The luminescence intensity demonstrates remarkable dependence on the A- and B-sites occupation, and the UC green, red, and NIR luminescence can be enhanced for 10, 25, and 10 times, respectively, upon a change of p from 3.5 to 5.0. This dependence is found to be tightly correlated with the crystal field environment, as characterized by the local lattice distortion. This work sheds light onto an alternative strategy to enhance the UC luminescence in this FTTB family.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 5
·3267-3279
·
IF 2.599
Duan Haojie,Wang Yifang,Li Shuo,Li Haiying,Liu Li,Du Liting,Cheng Yali
Pure and Ho-doped In 2 O 3 nanotubes (NTs) and porous nanotubes (PNTs) were successfully synthesized by conventional electrospinning process and the following calcination at different temperatures. X-ray diffractometry (XRD), thermogravimetric analysis (TGA), Raman spectrometer, energy-dispersive spectroscopy, scanning and transmission electron microscopy were carefully used to investigate the morphologies, structures and chemical compositions of these samples. Their sensing properties toward ethanol gas were studied. Compared with pure In 2 O 3 NTs (response value is 17), pure In 2 O 3 PNTs (response value is 20) demonstrated enhanced sensing characteristics. What’s more, the response of Ho-doped In 2 O 3 PNTs sensors to 100 ppm ethanol was up to 60 at 240 °C, which increased three times more than that of the pure In 2 O 3 PNTs. Additionally, the minimum concentration for ethanol was 200 ppb (response value is 2). The increased gas-sensing ability was attributed not only to the hollow and porous structure, but to the Ho dopant. Furthermore, Ho-doped In 2 O 3 PNTs enable sensor to discriminate between ethanol and the other gas distinctly, particularly acetone that is usually indistinguishable from ethanol. Also, by analyzing XRD, TGA and Raman spectrometer, a possible formation mechanism of porous nanotubes and sensing mechanism were put forward.
研究领域:
材料科学
·
纳米技术
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传感器学
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无机功能材料
·
化学传感
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）