Nature Communications
·
2021
·Vol. 12
·期 1
·1-7
·
IF 14.919
Lian Weitao,Jiang Chenhui,Yin Yiwei,Tang Rongfeng,Li Gang,Zhang Lijian,Che Bo,Chen Tao
Antimony trisulfide (Sb 2 S 3 ) is a kind of emerging light-harvesting material with excellent stability and abundant elemental storage. Due to the quasi-one-dimensional symmetry, theoretical investigations have pointed out that there exist complicated defect properties. However, there is no experimental verification on the defect property. Here, we conduct optical deep-level transient spectroscopy to investigate defect properties in Sb 2 S 3 and show that there are maximum three kinds of deep-level defects observed, depending on the composition of Sb 2 S 3 . We also find that the Sb-interstitial (Sb i ) defect does not show critical influence on the carrier lifetime, indicating the high tolerance of the one-dimensional crystal structure where the space of (Sb 4 S 6 ) n ribbons is able to accommodate impurities to certain extent. This study provides basic understanding on the defect properties of quasi-one-dimensional materials and a guidance for the efficiency improvement of Sb 2 S 3 solar cells.
研究领域:
材料科学
·
光伏技术
·
缺陷工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Cong Fu,Lingfang Liu,Cici Wang,Weixin Huang,Guofeng Zhao
Unraveling the effect of defects on the concentration of surface-available photoexcited charges is of great importance for semiconductors in photocatalysis. Herein, by using in situ diffuse-reflectance infrared (IR) spectroscopy, the concentration of surface-available photoholes on TiO2 nanoparticles with tunable bulk/surface defects was quantified by an adsorbate (methanol) surface elementary reaction kinetic analysis method. Reaction kinetics showed that the oxidation of the adsorbed methanol species under light irradiation was a first-order reaction. Therefore, the concentration of surface-available photoholes can be calculated from the rate constants of adsorbed methanol on the TiO2 surface. By carefully comparing the specific reaction rate constants on the TiO2 surface with various bulk/surface defect ratios, we demonstrated for the first time that increasing the bulk defect concentration relative to the surface defects decreases the concentration of surface-available photoholes. This trend implicates different effects of bulk and surface defects on band bending and subsequent interfacial hole transfer processes in TiO2 nanoparticles. These insights not only reveal the mechanistic role of surface and bulk defects in photocatalysis but also highlight that in situ IR spectroscopy combined with reaction kinetic analysis has enormous potential in elucidating photocatalytic mechanisms.
研究领域:
光催化
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材料化学
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表面科学
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物理化学
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纳米材料
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分析化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Jiada Han,Huanhuan Yang,Hao Yan,Xianglong Sun,Qingwu Huang,Man Zhang,Shasha Zhang,Yiqiang Zhang,Yanlin Song
Perovskite solar cells (PSCs) have become a highly anticipated research direction in the field of next-generation photovoltaic technology due to their excellent photoelectric conversion performance. One core issue for high-performance PSCs is to suppress the non-radiative recombination caused by defects in the perovskite layer and at the interfaces. In this work, a novel functionalized sulfonate-based ionic liquid, 1-ethyl-3-methylimidazolium methyl sulfonate (EMIM-MS), is introduced for in situ defect passivation during the perovskite crystallization process. For the anionic part of EMIM-MS, the -SO 3 − group can form coordination with Pb 2+ , and the -CH 3 groups can form hydrogen bonds with I−. Coupled with the formation of hydrogen bonds between EMIM-MS and formamidinium (FA + ), high-quality perovskite films with large crystal size and low defect density are achieved. In addition, due to its large molecular size, EMIM-MS can be squeezed to the surface during annealing, playing an important role in passivating defects at the interfaces. Therefore, the efficiency of PSC based on EMIM-MS is significantly improved to 25.48% from the controlled 22.24%, and the long-term storage and wet heat stability are also improved. This strategy provides valuable insights for defect passivation and helps promote the industrialization of PSC.
研究领域:
材料科学
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光伏技术
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纳米材料
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表面化学
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能源化学
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半导体器件
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yanzhen Yin,Wenhua Yang,Zhen Wang,Yue Zhang,Maochen Zhu,Chao Dou,Yang Che,Shijia Sun,Chen Hu,Bing Teng,Jiaqi Zhao,Jingyao Lu,Ruyi Sun,Degao Zhong
The struggle with "thermal load" is always an unavoidable challenge for photo-luminescent material. In this work, a novel red phosphor of ZnGa 2 O 4 : Eu 3+ with spinel-type structure is prepared by high-temperature solid-phase method. Due to the charge imbalance during the replacement processes of Ga 3+ →Zn 2+ and Eu 3+ →Zn 2+ in mixed spinel structure, vacancy defects can be introduced into the lattice structure of ZnGa 2 O 4 : 0.02Eu 3+ . The results of Density Function Theory (DFT) calculation demonstrate that the existence of vacancy defects can construct defect energy levels in the energy band structure of the host crystal, which can assist enhancing the fluorescence emission intensity of the phosphor at high temperature. The strong thermal stability of its own structure combined with the assistance of defect energy levels enables the achievement of zero-thermal quenching in ZnGa 2 O 4 : 0.02Eu 3+ under multi-wavelength excitation. Our results open up a new way for the exploration and utilization of zero-thermal quenching phosphors.
研究领域:
材料科学
·
发光材料
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固态化学
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计算材料学
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无机功能材料
✓ 已验证
DOI
高影响因子
Metabolomics
·
2017
·Vol. 13
·期 12
·1-14
·
IF 3.692
Tang Tian,Gao Qun,Lin Hua,Biville Francis,Xiong Jingyuan,Pei Xiaofang,Zheng Bo,Zou Xiaoli,Wang Chuan
Introduction ClpXP protease is an important proteolytic system in Salmonella enterica serovar typhimurium ( S. typhimurium ). Inactivation of ClpXP by deletion of clpP resulted in overproduction of RpoS and a growth defect phenotype. Only one report has indicated that deleting rpoS can restore the growth of a S. typhimurium clpP mutant to the wild-type level. Whether overproduction of RpoS is responsible for the growth deficiency resulting from clpP disruption and how ClpXP affects the cell metabolism of S. typhimurium remain to be elucidated. Objectives The aim of this study is to investigate the effect of ClpXP on cell metabolism of S. typhimurium and explore the possible co-effect of RpoS associated with ClpXP in cell metabolism. Method We constructed a clpP rpoS double deletion mutant TT-19 (Δ clpP Δ rpoS TT-1) using a two-step phage transduction technique. We then compared the metabolite fingerprints of Salmonella rpoS deletion mutant TT-14 (Δ rpoS TT-1), clpP deletion mutant TT-16 (Δ clpP TT-1), and clpP rpoS double deletion mutant TT-19 (Δ clpP Δ rpoS TT-1) with those of the wild-type strain TT-1 by using gas chromatography coupled with mass spectrometry (GC–MS). Results Deletion of rpoS recovered only a part of the growth of Salmonella clpP mutant. Further metabolome analysis indicated that clpP disruption changed the levels of 16 extra- and 19 intracellular substances, while the extracellular concentrations of 4 compounds (serine, l -5-oxoproline, l -glutamic acid, and l -tryptophan) and intracellular concentrations of 10 compounds ( l -isoleucine, glycine, serine, l -methionine, l -phenylalanine, malic acid, citric acid, urea, putrescine, and 6-hydroxypurine) returned to their wild-type levels when rpoS was also deleted. Conclusion ClpXP affects the cell metabolism of S. typhimurium partially in an RpoS-dependent manner.
研究领域:
微生物学
·
分子生物学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xinyi Song,Haipeng Rao,Chunchun Huang,Miaoling Huang,Ying Ma,Jingyu Xin,Jiajia Hou,Zhigang Hu,Lingfeng He,Feiyan Pan,Lingdong Yang,Zhigang Guo
Fumarate hydratase (FH) catalyzes the conversion of fumarate to malate in the tricarboxylic acid cycle. Its deficiency leads to fumarate accumulation, which is associated with kidney cancer metastasis, though the exact mechanisms remain unclear. Here, we identify prolyl 4-hydroxylase beta (P4HB) as a novel fumarate target in FH-deficient cancer cells that promotes migration and invasion. FH knockdown in human renal cancer cells significantly enhanced migratory and invasive capacities by 10- and 8-fold, respectively. Mechanistically, fumarate-induced succination stabilizes P4HB, promoting type I collagen production and enhancing tumor metastasis. P4HB knockdown markedly suppresses FH deficiency-induced metastasis in xenograft models. Fluorescence intensity in the FH knockdown group was about 10-fold higher, and tumor-bearing liver weight was approximately 1.5-fold greater than that in the FH and P4HB co-knockdown group. These results underscore the pivotal role of P4HB in metastasis. Additionally, we reveal NDP52 as a specific autophagy receptor that recognizes and binds to P4HB, mediating its degradation through the autophagy-lysosome pathway. However, succination of P4HB disrupts this recognition, interaction, and degradation, stabilizing P4HB. Together, these findings provide new insights into how fumarate-mediated succination affects P4HB protein stability and cancer metastasis, and suggest that P4HB could serve as a potential therapeutic target in FH-deficient cancers.
研究领域:
肿瘤学
·
细胞生物学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xiangjia Liu,Jin Li
In this study, a ZnO/NiS@NiO/rGO (ZNNG) composite was characterized using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and scanning electron microscopy (SEM). Compared with simple ZnO, ZNNG exhibited stronger green emissions, but no ultraviolet (UV) emission peak was observed. Through a comprehensive analysis of ultraviolet–visible (UV–vis) absorption spectra, Mott Schottky (MS) plots, electron paramagnetic resonance (EPR) spectra, and X-ray photoelectron spectroscopy (XPS) results, it was proved that the stable green emissions of ZnO and its composites originated from the quenching of electrons between Zn interstitial ( Zn i ) and surface oxygen defects. The introduction of NiS@NiO caused the conduction band (CB) and valence band (VB) of ZnO to change to lower energy states, effectively increasing the absorption intensities of ZnO in the visible light, while introducing numerous oxygen-related defects on the surface of ZnO. Further addition of rGO effectively promoted the migration of electrons from the CB to the Fermi energy (E f ). These effects effectively increased the green emission of ZnO and reduced the UV emission. Finally, a proper mechanism for the near-zero band gap NiS@NiO/rGO that can significantly enhance the green emission of ZnO was proposed.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Shaokun Ling,Xiaoyan Qin,Chang chen,Kai Meng,Yifeng Yan,Junyun Ming,Sen Liao,Yingheng Huang,Lei Hou
Despite long-term development of LEDs, problems urgent to resolve is still existing. The most outstanding problem to tackle is luminescent stability at high temperature working situation. In this study, a novel type of β-NaYF 4 based phosphor incorporated with Eu 3+ and Tb 3+ is reported. A series of β-NaYF 4 :0.065Eu 3+ , x Tb 3+ ( x = 0.001, 0.002, 0.003, 0.004, 0.005) phosphors were synthesized by hydrothermal method . The sample β-NaYF 4 :0.065Eu 3+ ,0.002Tb 3+ possesses optimal luminescent property at room temperature. The mechanism of energy transfer from Tb 3+ to Eu 3+ ion is quadrupole-quadrupole interactions. The sample β-NaYF 4 :0.065Eu 3+ ,0.002Tb 3+ demonstrates zero thermal quenching (ZTQ) property at 303 K to 383 K. According to XRD and XPS characterizations, nonequivalent replacement between intrinsic ion Na + and Y 3+ were discovered, which finally leads to production of crystal defects. According to electron paramagnetic resonance (EPR) characterization and density functional theory (DFT) calculation, the type of crystal defect of β-NaYF 4 :0.065Eu 3+ ,0.002Tb 3+ is confirmed to be V Y vacancies which are the predominant defect of crystal. The depths and densities of defects were calculated according to data of thermoluminescence spectra (TL spectra). Crystal defects play the role of electrons traps that could store electrons. Electrons stored in traps will be excited to excitation state of Eu 3+ under the thermal stimulation to offset undesirable impact of thermal quenching (TQ), which leads to ZTQ property of the sample β-NaYF 4 :0.065Eu 3+ ,0.002Tb 3+ . The CRI and CCT of fabricated WLED are 3830 K and 84.1, respectively.
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 ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Tengfei Zhang,Dan Xu,Ping Liu,Long Chen,Wen Guo,Tiantian Gu,Feng Yu,Yanyan Liu,Gang Wang
The development of economical, efficient, and durable bifunctional catalyst for overall water splitting is an attractive and challenging task. Herein, a novel defect-rich 2D/2D heterostructure is constructed by vertically growing S-doped NiMoO 4 (NiMoO 4 -S) nanosheets on nickel sulfide (Ni 3 S 2 ) nanosheet arrays supported on nickel foam (NF) using a two-step hydrothermal method. Benefiting from the hierarchical sheet-on-sheet heterogeneous nanostructure and abundant oxygen vacancies for more active sites, efficient electronic/mass transfer, and fast gas release, the synthesized NiMoO 4 -S/Ni 3 S 2 /NF electrode exhibits excellent electrocatalytic performance for HER (η 10 mA cm −2 = 107 mV) and OER (η 50 mA cm −2 = 285 mV). The alkaline water electrolyzer with NiMoO 4 -S/Ni 3 S 2 /NF as the positive and negative electrodes can provide a current density of 10 mA cm −2 with the potential of 1.52 V, which is below that of the commercial Pt||RuO 2 /NF system or many other reported systems. More importantly, the alkaline water electrolyzer offers a current density of 100 mA cm −2 at 1.85 V with outstanding durability of over 50 h. This research points to a promising route in designing transition metal-based bifunctional electrocatalysts for large-scale energy conversion applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Sixia Li,Peng Zhang,Fang Lu,Zhou Sai,Weisheng Liu
Self-activated near-infrared (NIR) phosphors have garnered increasing attention in advanced light sources and biomedical applications owing to their simplified synthesis, cost-efficiency, non-toxicity, and especially the absence of extrinsic activator ions. However, developing efficient and thermally stable self-activated NIR phosphors remains a significant challenge for practical applications. Herein, a NIR phosphor Ca 0 · 95 LaMgSbO 6 (C 0.95 LMSO) (λex = 335 nm, λem = 710 nm) is synthesized employing a non-stoichiometric strategy, where interstitial oxygen (Oᵢ) defects are identified as the primary origin for the self-activated NIR luminescence through synergistic experimental and theoretical analyses. The controlled Ca 2+ deficiency promotes the generation of more Oᵢ defects, thereby enhancing the intensity of Oᵢ defect-induced near-infrared luminescence. Furthermore, the introduction of Bi 3+ sensitizers enables efficient energy transfer pathways, the optimized phosphor leading to exceptional photoluminescence quantum yield (68.1 %) and thermal stability (67.2 % intensity retention at 420 K). A fabricated NIR pc-LED based on Ca 0 · 95 LaMgSbO 6 :0.5 %Bi 3+ (C 0.95 LMSO: Bi 3+ ) phosphor exhibit promising performance in night vision and biomedical imaging applications. This study elucidates a defect-engineering paradigm grounded in oxygen interstitial defects, presenting a new research avenue for the development of high-performance self-activated NIR materials.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 24
·2101927
·
IF 18.808
Yuancai Gong,Ruichan Qiu,Chuanyou Niu,Junjie Fu,Erin Jedlicka,Rajiv Giridharagopal,Qiang Zhu,Yage Zhou,Weibo Yan,Shaotang Yu,Jingjing Jiang,Sixin Wu,David S. Ginger,Wei Huang,Hao Xin
The large open-circuit voltage deficit ( V oc,def ) is the key issue that limits kesterite (Cu 2 ZnSn(S,Se) 4 , [CZTSSe]) solar cell performance. Substitution of Cu + by larger ionic Ag + ((Ag,Cu) 2 ZnSn(S,Se) 4 , [ACZTSSe]) is one strategy to reduce Cu–Zn disorder and improve kesterite V oc . However, the so far reported ACZTSSe solar cell has not demonstrated lower V oc,def than the world record device, indicating that some intrinsic defect properties cannot be mitigated using current approaches. Here, incorporation of Ag into kesterite through a dimethyl sulfoxide (DMSO) solution that can facilitate direct phase transformation grain growth and produce a uniform and less defective kesterite absorber is reported. The same coordination chemistry of Ag + and Cu + in the DMSO solution results in the same reaction path of ACZTSSe to CZTSSe, resulting in significant suppression of Cu Zn defects, its defect cluster [2Cu Zn + Sn Zn ], and deep level defect Cu Sn . A champion device with an efficiency of 12.5% (active area efficiency 13.5% without antireflection coating) and a record low V oc,def (64.2% Shockley–Queisser limit) is achieved from ACZTSSe with 5% Ag content.
研究领域:
材料科学
·
光伏技术
·
半导体物理
·
无机化学
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能源材料
·
固态化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yang Yu,Siyuan Li,Yu Feng,Dechao Bu,Xuan Gao,Ling Weng,Qingguo Chen
Due to their excellent electrical potential stranglehold capability to over-voltage, ZnO-Bi 2 O 3 based varistor ceramics are extensively utilized in surge arresters. Unfortunately, Bi 2 O 3 has high volatility at high-temperature sintering, and ZnO-Bi 2 O 3 based varistor ceramics has a complex formulation that is difficult to control. Recently, the approach of constructing defect dipoles through defect engineering have emerged as an effective strategy to enhance the performance of electroceramics. In this paper, we introduce Fe 3+ as donor and Li + as acceptor to replace Zn 2+ for constructed defective dipole pairs in the ZnO lattice. The substitution enables induced the nonlinear conductivity properties in ZnO at lower doping levels. Meanwhile, the result as designed (Fe 0.5 Li 0.5 ) x Zn 1- x O 2 varistor ceramics ( x = 20 mol%) exhibit a breakdown voltage gradient E b of 1422.09 V/mm. The research provides a new perspective for developing high-performance bismuth-free ZnO-based varistor ceramics.
研究领域:
材料科学
·
电瓷材料
·
固态物理
·
电子器件
✓ 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）