JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2014
·
IF 1.61
Pengjun Zhao,Lei Wang,Liang Bian,Jinbao Xu,Aimin Chang,Xinqian Xiong,Fanglong Xu,Jiaqi Zhang
Three-dimensional hierarchical structure coral-like BaTiO 3 nanoparticles have been self-assembled by a facile one step hydrothermal method . Cetyltrimethyl ammonium bromide (CTAB), Ba(OH) 2 ·8H 2 O and tetrabutyl titanate have been used as precursors. The prepared BaTiO 3 exhibits cubic perovskite phase at room temperature, and the coral-like architecture is a micro-nano hiberarchy consisted of dendrimer-like structure and trunk-like structure. By adjusting the hydrothermal duration and the precursor substances, a surfactant induced mechanism is proposed to understand the self-assembly process. UV-vis measurement demonstrates that the as-prepared BaTiO 3 nanoparticles exhibit dozens of times overwhelming absorptive character compared to the ordinary nanospheres at ultraviolet band, which is benefited from the coral-like porous framework. Moreover, halogen anions( F − , Cl − , Br − , and I − ) have been chosen to adjust the coral-like BaTiO 3 physical properties. Results show the halogen doping produces distinct modulation effect on the grain size, UV-vis absorbance and photoluminescence properties of the materials. The coral-like BaTiO 3 nanoparticle and its halogen modified ramifications offer significant opportunities to develop nano-laser devices, photon detectors, photocatalyst based on BaTiO 3 perovskite materials.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2020
·
IF 4.089
Fangbao Wang,Hongjian Zhang,Qihao Sun,Ahmed Ben Hafsia,Zhangxuan Chen,Binbin Zhang,Yadong Xu,Wanqi Jie
The all-inorganic halide perovskite CsPbBr3 exhibited extraordinary photoelectric properties as well as great potential for various optic-electronic devices. The introduction of a Cl/I dopant is an effective method to optimize their properties. However, it is still a challenge to grow doped CsPbBr3 single crystals from solution. In this work, we report on the crystal growth of Cl/I-doped CsPbBr3 crystals using the modified inverse temperature crystallization (ITC) method. The components of raw materials and solvent in precursors were precisely tailored. The resulting doping ratio between the actual content and the nominal content are 0.99 and 0.046 for Cl and I, respectively. It indicates that I ion doped crystals exhibit more severe stoichiometric deviation due to the lower decomposition energy. The crystal structure, morphology, and optical properties of doped crystals were also investigated systematically. The {101} and {010} facets of as-grown crystals were influenced by the doping process. PL and UV transmittance spectra exhibited changes in the band gap in Cl/I-doped crystals. Finally, the phase diagram of basic photoelectric properties was determined for CsPb(Br1–nCln)3 crystals and it reveals conductive type changes from the P type to N type with an increase in the doping content of the Cl element. The optimum component of CsPb(Br0.93Cl0.07)3 demonstrates the highest resistivity of 4.3 × 109 Ω cm, an on/off ratio of ∼40, and a mobility of 414 cm2 V–1 s–1 as well as the lowest carrier concentration of 3.57 × 107 cm–3. Our work provides a strategy to grow doped halide perovskite crystals and tailor their optical and electrical properties.
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 Chemistry C
·
2025
·
IF 5.1
Changsheng Yin,Ruiwen Hu,Xiaolu Mao,Chunli Cai,Xuhuan Li,Xiaodong Shen,Wenbo Xin
The modification of carbon nanotube (CNT) films is of great significance for improving their performance and expanding their applications. Halogen doping is found to be an effective way to enhance the electrical conductivity of CNT materials; however, the process either requires a harsh environment or time-consuming and tedious operations. In this study, we report a fast processing approach to efficiently enhance the electrical properties of CNT films. Based on a simple electrolytic process, halogens (Cl and Br) are doped into CNT films, inducing electron transfer from CNTs to halogens due to the high electronegativity of halogens. We employ XPS and Raman spectroscopy to confirm the occurrence of halogen (Cl and Br) dopants and the electron transfer phenomenon in the system. We emphasize that this approach allows us to complete the doping process in 90–180 seconds. Cl doping and Br doping increase the electrical conductivity of CNT films by nearly 21 and 20 times, with the values enhanced from 1.31 × 104 S m−1 to 2.73 × 105 S m−1 and to 2.62 × 105 S m−1, respectively. Moreover, the recycling results of doping and annealing show that this approach is revisable, which offers great potential in the emerging nanotechnology fields, such as energy storage, high-sensitivity sensors and electromagnetic interference shielding.
研究领域:
材料科学
·
纳米技术
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Hao Yang,Li Han,Dongrui Hou,Yongchang Liu,Shuaijun Huang,Zirui Peng,Zirui Yang,Tianliang Lu,Xiaoqin Si,Xin liu,Jinrong Li,Jianfeng Wang
A series of S-scheme heterojunctions, XCN@MoO 3 (XCN@M, X = Cl, Br, I), were synthesized via a simple thermal polymerization, and the effect of halogen doping on construction of S-scheme heterojunctions was systematically explored. The ICN@M heterojunction showed exceptional photocatalytic performance, achieving 100 % degradation of 50 mg/L RhB in 90 min, 40.37 times and 2.34 times higher than pure g-C 3 N 4 and CN@M, respectively. Notably, ICN@M outperformed CN@M and some other photocatalysts reported. DFT result revealed halogen doping reduced the work function of CN, proved the maximum work function difference of ICN@M and the formation of the strongest built-in electric field between the surface of MoO 3 with an electron-rich region and the surface of ICN with a hole-rich region, thus facilitating electron transfer at the heterojunction interface, reducing recombination of photogenerated carriers and promoting the catalytic performance. Fukui function and frontier orbital theory identified a possible degradation pathway of RhB dominated by ∙O 2 – and 1 O 2 and the toxicity of final products during the photocatalysis degradation of RhB was evaluated. This work highlighted the importance of work function differences in designing photocatalyst heterostructures and offered a new option for environmental treatment.
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
Advanced Materials Interfaces
·
2018
·Vol. 5
·期 5
·1701261
·
IF 4.834
Huanlong Liu,Yufeng Tang,Wei Zhao,Wei Ding,Jijian Xu,Chenliang Liang,Zhichao Zhang,Tianquan Lin,Fuqiang Huang
Nonmetal-dual doped graphene has attracted considerable attention as high-performance anode material for lithium-ion batteries (LIBs) due to the synergistic effects of heteroatom dopants. Herein, nitrogen and halogen (including Cl, Br, and I) dual-doped graphene is successfully synthesized by a general wet chemical method and lithium storage performance of N, Cl codoped graphene as anode material for LIBs is investigated in detail. The dual-doped heteroatoms introduce abundant defects and expand the interlayer spacing of graphene to benefit lithium insertion and extraction. When used as a typical anode material, the N and Cl dual-doped porous graphene reveals a high specific capacity of 1200 mA h g −1 at 0.1 A g −1 and 1010 mA h g −1 at 1.0 A g −1 . The as-prepared sample exhibits superior cycling performance, whose specific capacity remains 95% at 5.0 A g −1 after 1800 cycles. The excellent performance mainly stems from the synergistic effect of structure modification and heteroatom doping, and the capacitive effects are dictated by kinetical analysis. The synthesized nitrogen and halogen dual-doped porous graphene is a promising anode material for LIBs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 18
·6645-6652
·
IF 5.7
Feng-Yi Wu,Yuan-Sheng Cheng,Kong-Lin Wu,Rong Wu,Rui Yu,Ping-Li Guan,Yu-Wen Cheng,Wen-Jiang Li,Ji-Liang Yang,Xian-Wen Wei
Developing an ideal luminescent material with exceptional performance in various aspects, such as affordability, low toxicity, high photostability and security, is vital for advanced optical anti-counterfeiting. Here, halogen-doping-dependent luminescence MoS2 quantum dots were synthesized via a simple hydrothermal method for optical anti-counterfeiting ink. The results show that F−, Cl− and Br− doping results in notable fluorescence blueshifts of MoS2 quantum dots and significant enhancements in the photoluminescence quantum yield (PLQY) of up to 5.7, 5.0, and 3.2 times, respectively. However, I− incorporation causes a fluorescence redshift and a 25% decrease of PLQY. This mechanism is elucidated using density functional theory (DFT) and experiments. Specifically, F−, Cl− and Br− doping localizes surface electrons and blocks sulfur vacancies in MoS2 quantum dots, enhancing the release of neutral excitons from trions and defect-bound excitons. Conversely, I− doping increases the surface charge and sulfur vacancies, favouring the conversion of neutral excitons into trions and defect-bound excitons. The halogen-doped MoS2 quantum dots are engineered as security ink, demonstrating high concealment, excellent photostability and easy fabrication. The study offers a novel way of tailoring fluorescence of MoS2 quantum dots, potentially extending to other transition metal dichalcogenide quantum dots and their optical anti-counterfeiting implementation.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Light-Science & Applications
·
2022
·Vol. 11
·期 1
·1-11
·
IF 20.257
Liu Yanfeng,Al-salihi Mahmoud,Guo Yong,Ziniuk Roman,Cai Songtao,Wang Luwei,Li Yuan,Yang Zhigang,Peng Dengfeng,Xi Kai,An Zhongfu,Jia Xudong,Liu Liwei,Yan Wei,Qu Junle
Flexible organic materials that exhibit dynamic ultralong room temperature phosphorescence (DURTP) via photoactivation have attracted increasing research interest for their fascinating functions of reversibly writing-reading-erasing graphic information in the form of a long afterglow. However, due to the existence of a nonnegligible activation threshold for the initial exposure dose, the display mode of these materials has thus far been limited to binary patterns. By resorting to halogen element doping of carbon dots (CDs) to enhance intersystem crossing and reduce the activation threshold, we were able to produce, for the first time, a transparent, flexible, and fully programmable DURTP composite film with a reliable grayscale display capacity. Examples of promising applications in UV photography and highly confidential steganography were constructed, partially demonstrating the broad future applications of this material as a programmable platform with a high optical information density.
研究领域:
材料科学
·
光学
·
信息加密
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2014
·
IF 2.703
Xiuna Yu,Ziyang Lu,Naichao Si,Weichao Zhou,Tingting Chen,Xun Gao,Minshan Song,Yongsheng Yan,Pengwei Huo,Chunyong Yan
Rare earth metal ions had been immobilized on TiO 2 Hal with conducting polymers by ions imprinting technique. The as-prepared ions imprinting photocatalysts had been characterized by SEM, XRD, FT-IR, UV–vis DRS and ICP-AES. The results demonstrated that there were rare earth metal ions in the photocatalysts. The photocatalytic activity of the ions imprinting photocatalysts was studied by the degradation of tetracycline simulated wastewater under the visible light irradiation. Moreover, a series of synthetic factors were also investigated, the results indicated that it was better to choose o-phenylenediamine as functional monomer , the photocatalytic activity of degradation of tetracycline solution could be improved by adding the rare earth metal ions, Y 3 + was the most appropriate ion and the best synthetic concentration of Y 3 + was 0.02 g. Under the optimal conditions, the photodegradation rate could reach 78.80%.
研究领域:
环境科学
·
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Mingyuan Guo,Yongning Ma,Zhanqing Liu,Donghua Wang,Yuhao Yang,Xiaolong Li,Enzhou Liu
Halogen doping is an effective approach to regulate the electronic structure and improve photocatalytic properties of g-C 3 N 4 . Here, a salt-assisted approach was employed to prepare layered porous halogen-doped g-C 3 N 4 . The effects of halogen electronegativity and pore morphology were discussed. Highly electronegative F-doped g-C 3 N 4 with smaller pore size and higher surface area displayed the enhanced absorption property on reactants. The H 2 production rate decreased and the RhB degradation significantly increased with increasing the electronegativity of layered porous g-C 3 N 4 , which was significantly different from the conventional halogen-doped g-C 3 N 4 prepared with halogenated acid and monolayer g-C 3 N 4 . The decreased H 2 evolution can be ascribed to the strong adsorption property, and the strong interactions between halide ions and H + were difficult to be disassociated. Additionally, the RhB degradation performance of halogen-doped g-C 3 N 4 significantly increased with increasing the electronegativity. The most active species that dominated the RhB degradation of F-doped g-C 3 N 4 are leaved holes (h + ), which are totally different from that of the pristine g-C 3 N 4 and Cl/Br-doped g-C 3 N 4 (superoxide radicals,·O 2 – ). This work helps us to well understand the role and importance of electronegativity and pore morphology on the H 2 generation and RhB degradation properties of layered porous g-C 3 N 4 .
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 8
·2705-2713
·
IF 5.7
Yang Yang,Zisheng Wang,Jiahao Jie,Chunqing Hou,Yilong Song,Yuhao Fu,Lijun Zhang,Qingfeng Dong
Lead-based perovskites have been prominently featured across diverse fields. Nevertheless, the intrinsic toxicity associated with lead compounds presents substantial environmental and health concerns. Thus, it has become imperative to seek alternatives devoid of lead. Our research presents a pioneering solution to this predicament by zeroing in on cesium-manganese-bromide-based perovskite crystals. Our research involves doping the pseudohalide anion acetate (Ac−) into halide positions within CsMnBr3·2H2O crystals, resulting in a remarkable improvement in their luminescence characteristics. The optimized CsMnBr3·2H2O:Ac− crystals displayed a photoluminescence quantum yield (PLQY) surpassing 70%, marking a substantial advancement compared to the modest PLQY observed in pristine CsMnBr3·2H2O bulk crystals. Theoretical analysis was employed to ascertain the precise lattice position occupied by Ac−. High-performance ion chromatography confirmed the presence of Ac− and determined the pseudohalide concentration. Studies on carrier dynamics to investigate the impact of Ac− on CsMnBr3·2H2O revealed that the significant enhancement in emission following Ac− doping is linked to the mitigation of nonradiative carrier trapping processes. The differences in Mn–Mn dipole–dipole and spin-exchange interactions were verified through electron paramagnetic resonance, magnetic measurements and femtosecond transient photoluminescent spectroscopy. The experimental data prove that the doping of Ac− leads to a decrease in spin-exchange interaction, which consequently decelerates the separation of holes and electrons, subsequently facilitating the recombination process. Our study provide valuable insights into the mechanism by which pseudohalide affects the perovskite sample, with Ac− suppressing non-radiative recombination processes and also influencing the exciton dissociation, leading to enhanced efficiency in radiative recombination processes. The findings furnish a promising method of conditioning the properties of perovskite crystals, which offers a new way for materials design towards diverse emerging applications.
研究领域:
材料科学
·
光学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2022
·Vol. 9
·期 29
·2203436
·
IF 17.521
Tingting Deng,Zhiqiang Gao,Pengfei Qiu,Tian-Ran Wei,Jie Xiao,Genshui Wang,Lidong Chen,Xun Shi
The recently discovered ductile/plastic inorganic semiconductors pave a new avenue toward flexible thermoelectrics. However, the power factors of current ductile/plastic inorganic semiconductors are usually low (below 5 µW cm −1 K −2 ) as compared with classic brittle inorganic thermoelectric materials, which greatly limit the electrical output power for flexible thermoelectrics. Here, large plasticity and high power factor in bulk two-dimensional van der Waals (2D vdW) single-crystalline SnSe 2 are reported. SnSe 2 crystals exhibit large plastic strains at room temperature and they can be morphed into various shapes without cracking, which is well captured by the inherent large deformability factor. As a semiconductor, the electrical transport properties of SnSe 2 can be readily tuned in a wide range by doping a tiny amount of halogen elements. A high power factor of 10.8 µW cm −1 K −2 at 375 K along the in-plane direction is achieved in plastic single-crystalline Br-doped SnSe 2 , which is the highest value among the reported flexible inorganic and organic thermoelectric materials. Combining the good plasticity, excellent power factors, as well as low-cost and nontoxic elements, bulk 2D vdW single-crystalline SnSe 2 shows great promise to achieve high power density for flexible thermoelectrics.
研究领域:
材料科学
·
热电学
·
柔性电子学
·
无机半导体
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Xiao Yu,Mengyi Shi,Yixuan Fan,Lixia Yang,Jie Zhang,Wei Liu,Weili Dai,Shuqu Zhang,Lei Zhou,Xubiao Luo,Shenglian Luo
Mn 2 O 3 is an exceptional earth-abundant mineral that has been extensively applied in catalytic oxidation because of the strong redox couples like Mn 3+ /Mn 2+ and Mn 4+ /Mn 3+ exposed on Mn 2 O 3 surface. Herein, the catalytic activity of Mn 2 O 3 in photothermal degradation of toluene was regulated by halogens including F - , Cl -, and Br - . As the electronegativity ordered in F (3.98) > O (3.44) > Cl (3.16) > Br (2.96), F - doped Mn 2 O 3 overperforms Cl - doped and Br - doped Mn 2 O 3 in decomposing toluene. DFT theoretical calculation illustrates that F - attracts the shared electrons from Mn to itself, the deviated charge center stretches the adjacent Mn-O bonds and boosts the generation of abundant oxygen vacancies, helping to strengthen the catalytic activity of Mn 2 O 3 . Conversely, Mn-O bonds are shortened by Cl - and Br - that have lower electronegativity than O. The multiple electrons circling Cl - and Br - push Mn towards O and squeeze Mn-O bonds, resulting in the formation of passivated Mn 2 O 3 . In conjunction with Mn redox couples and oxygen vacancies, 99% of 400 ppm toluene can be eliminated by F - doped Mn 2 O 3 , corresponding mineralization rate is high up to 95.8%.
研究领域:
催化
·
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）