CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jiahui Ma,Ning Xu,Yuxin Luo,Qi Liu,Yongping Pu
Ceria is widely used in industrial fields due to its unique chemical properties. In this work, a series of CeO 2 particles with controllable morphology, size, and defect concentration were obtained by a simple molten salt method. The adjustment of temperature and molten salt concentration has a considerable effect on the morphology and particle size of the final CeO 2 particles while prolonging the holding time has little effect. Ion doping and reducing atmosphere calcination were used to regulate the defect concentration to improve the chemical activity of CeO 2 particles. SEM results show that the morphology of CeO 2 particles transforms from sphere to octahedron under the two treatments. The Rietveld refinement results and the XPS spectra indicate that increasing calcination temperature, reducing atmosphere calcination and ion doping are beneficial to improving the oxygen vacancies and Ce 3+ concentration of CeO 2 samples, which are the reason for enhancing the photocatalytic activity of the samples. Moreover, the oriented attachment, agglomeration and merging of crystals formed by the decomposition of cerium precursors are the key to the growth of CeO 2 particles. Aggregates with exposed low-energy planes merge directly to form particles of various morphologies to maintain their own low energy.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2018
·
IF 2.593
Yaru Shang,Yongping Cui,Ruixia Shi,Ping Yang
Hierarchical bismuth tungstate (Bi 2 WO 6 ) with various morphologies was successfully prepared by a simple hydrothermal method . The hierarchical Bi 2 WO 6 are all assembled from nanosheets . However, with increase of acetic acid the morphology of Bi 2 WO 6 transformed regularly according to the following order: clew-like, clew-like and flower-like, flower-like, dish-like with crisscross, dish-like with incomplete crisscross, and dish-like ones. Therefore, the effect of acetic acid on the morphology transformation of the Bi 2 WO 6 was investigated and a plausible formation mechanism was proposed. Owing to the larger specific surface area and pore diameter , the clew-like Bi 2 WO 6 exhibited enhanced photocatalytic activity for the degradation of Rhodamine B (RhB). Furthermore, the possible mechanism of photocatalytic degradation was discussed.
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
LANGMUIR
·
2015
·
IF 4.457
Yong-Qiang Liu,Hao-Di Wu,Yu Zhao,Ge-Bo Pan
Foreign ions are of significant importance in controlling and modulating the morphology of semiconductor nanocrystals during the colloidal synthesis process. Herein, we demonstrate the potential of foreign metal ions to simultaneously control the morphology and crystal phase of chalcogenide semiconductors. The results indicate that the introduction of Al3+ ions can induce the structural transformation from monoclinic CuClSe2 microribbons (MRs) to klockmannite CuSe nanosheets (NSs) and the growth of large-sized CuSe NSs. The as-prepared micrometer-sized CuSe NSs exhibit a high-conducting behavior, long-term durability, and environment stability. The novel properties enable CuSe NSs to open up a bright prospect for printable electrical interconnects and flexible electronic devices.
研究领域:
材料科学
·
半导体物理
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-7
·
IF 5.578
Chen Liang,Zhang Yu,Zhu Pengli,Zhou Fengrui,Zeng Wenjin,Lu Daoqiang Daniel,Sun Rong,Wong Chingping
Monodisperse Cu 2 O of different microstructures, such as cubes, flower-like and microspheres, have been extensively synthesized by a simple polyol reduction method using different copper salts, i.e. (Cu(acac) 2 , Cu(OH) 2 and Cu(Ac) 2 ·H 2 O). The effects of copper salts on the morphology of Cu 2 O were investigated in details through various characterization methods, including X-ray diffraction, transmission electron microscopy, scanning electron microscopy and UV-Vis absorption spectra. The effects of morphology on the electrochemical properties were further studied. Among the different structures, Cu 2 O with the microspheric morphology shows the highest specific capacitance and the best cycling stability compared with those of the other two structures, thus bear larger volume charge during the electrochemical reaction due to the microspheres of small nanoparticles.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 22
·20315-20324
·
IF 2.22
Tan Yang,Zhang Zheng,Guo Fuqiang,Guo Renqing,Bai Haineng,Zhang Baohua,Li Xin,Yang Qian,Liu Xuebo
In this study, multi-shaped CdS was synthesized by hydro- and solvothermal methods. Interestingly, the results of scanning electron microscopy and transmission electron microscopy showed that branch-like CdS could be transformed into ball-like and flake-like in deionized water by ethylenediaminetetraacetic acid and l -cysteine, respectively, and the growth mechanism of CdS was discussed and explored: the ion-binding rate might be the main factor for the morphology transformation of CdS. X-ray diffraction and energy dispersive spectroscopy revealed branch-like CdS which exhibited the hexagonal phase. Besides, the optical characteristics of CdS were performed by ultraviolet–visible and photoluminescence spectrum. Also, CdS was utilized to explore the photocatalytic activity of rhodamine B, and the result showed that the photocatalytic activity of ball-like CdS was higher than flake-like and branch-like CdS.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 13
·2690-2697
·
IF 4.034
Ke Tang,Jingcai Zhang,Wenzhi Wang,Shuping Wang,Jinxin Guo,Yanzhao Yang
A simple protocol has been reported here to successfully perform a controllable conversion between Ce(OH)4 nanorods [Ce(OH)4-NR] and Ce(OH)4 nanoflowers [Ce(OH)4-NF] based on a prolonged mechanical force-driven stirring process. Results show that the Ce(OH)4 nanostructures undergo a morphology transformation from the initial nanorods to irregular nanoflowers, then to nanoflowers emanating from one center only, by varying the stirring time before solvothermal reaction. The detailed study confirmed that the mechanical force significantly improved the mass transport of the solution and drove the seeds of Ce(OH)4-NR [seeds-NR] to generate the seeds of Ce(OH)4-NF [seeds-NF]. The final CeO2 products (CeO2 nanorods [CeO2-NR] and CeO2 nanoflowers [CeO2-NF]) that inherited the original morphology were obtained by annealing Ce(OH)4-NR and Ce(OH)4-NF, respectively. To further optimize the performance of the final products, Au/CeO2-NR and Au/CeO2-NF were synthesized by a simple oxidation–reduction process, which led to increased surface areas and promising potential in CO oxidation.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2017
·Vol. 8
·期 45
·6964-6971
·
IF 5.375
Yanxin Qi,Bin Li,Yupeng Wang,Yubin Huang
Given the increasing prosperity of multifunctional poly(ethylene glycol) (mf-PEG), an amphiphilic triblock copolymer, poly(ethylene glycol)-block-poly(ε-caprolactone)-block-poly(allyl glycidyl ether) (mPEG-PCL-PAGE), was synthesized by a combination of living ring-opening polymerization (ROP) and click chemistry. A post-modification of the allyl groups can be achieved via a radical mediated thiol–ene reaction to prepare copolymers bearing side-chain carboxylic or amino groups [mPEG-PCL-PAGE(R)]. The chemical structures and compositions of these polymers were systematically characterized using Fourier transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance spectroscopy (1H NMR) and gel permeation chromatography (GPC). The copolymers could readily assemble into micelles in aqueous solution as confirmed by fluorescence spectroscopy, dynamic light scattering (DLS), transmission electron microscopy (TEM) and zeta potential measurements. MTT and hemocompatibility assays indicated that the micelles showed no associated cytotoxicity and could be potentially used for nanomedicine. Intriguingly, the specific sequence of [mPEG-PCL-PAGE(R)] showed pH-induced morphology transformation, while the corresponding polymer with a middle PAGE segment [mPEG-PAGE(R)-PCL] did not, which, we propose, was attributed to the tunable hydrophilicity and distinctive folding of the molecular chain at varied pH values. This finding offers a route to regulate the self-assembly behaviors in polymer systems by controlling the block sequence.
研究领域:
材料科学
·
生物医学工程
·
纳米医学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Chemistry
·
2018
·Vol. 61
·期 10
·1301-1306
·
IF 4.448
Wang Sheng,Wang Fang,Li Chengpeng,Li Teng,Cao Derong,Ma Xiang
A novel multifunctional molecule BTE-CNPH was designed and synthesized by connecting 2-(3′,5′-bis(trifluoromethyl)-biphenyl-4-yl)-2-cyanovinyl group to both side of the bisthienylethene (BTE), which exhibited excellent aggregation-induced emission (AIE) and bistable photochromism. High-contrast (>60) reversible fluorescence switching was achieved in the 1D nanowires, solid of BTE-CNPH and also in a polymethyl methacrylate (PMMA) film loaded with 1% BTE-CNPH under the alternative irradiation by 365 nm and visible light. Interestingly, the nanowire-like assembly morphology of BTE-CNPH in aqueous tetrahydrofuran (THF) solution of specific concentration was observed to translate into amorphous pieces gradually upon prolonged irradiation by the 365 nm, accompanying with photo-tunable AIE emission.
研究领域:
材料化学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2014
·Vol. 16
·期 37
·8684-8690
·
IF 3.858
Haihang Ye,Aiwei Tang,Chunhe Yang,Kai Li,Yanbing Hou,Feng Teng
High-quality rhombohedral digenite (Cu1.8S) nanocrystals (NCs) were synthesized using a facile one-pot approach, in which foreign metal ions (Zn2+ and Cd2+) were added to drive a transformation in the phase and morphology of the as-obtained Cu2−xS NCs. During this process, the as-obtained products could transform from monoclinic djurleite (Cu1.94S) NCs to rhombohedral Cu1.8S NCs in the presence of Zn2+ and Cd2+ ions by extending the reaction time and increasing the reaction temperature, which could provide sufficient energy to overcome activation energy barriers. Moreover, we further studied the evolution of the plasmonic properties of the as-obtained Cu2−xS NCs, and the near-infrared (NIR) localized surface plasmon resonance (LSPR) absorption wavelength could be tuned by varying the amount of Zn2+ and Cd2+ ions added into the reaction system, which was in close association with the change in copper deficiencies and free hole densities induced by foreign metal ions.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Science China-Chemistry
·
2023
·Vol. 66
·期 12
·3587-3593
·
IF 9.6
Zhang Mengmeng,Hou Zaiyan,Liu Simeng,Han Guoqiang,Tian Meirong,Zhu Jintao,Xu Jiangping
Development of block copolymer (BCP) microparticles with switchable morphology in response to external stimuli is important for exploiting new intelligent materials. In this work, thermo/pH dual-responsive nanoparticles (NPs) were employed as a co-surfactant to modulate the self-assembly morphology of polystyrene- b -poly(2-vinylpyridine) (PS- b -P2VP) microparticles within confined emulsion droplets. The co-surfactant was synthesized by grafting poly(acrylic acid)- b -poly( N -isopropylacrylamide) onto the surface of Fe 3 O 4 NP. The introduction of the dual-responsive co-surfactant enabled thermo/pH dual-responsive reversible morphology transition of the PS- b -P2VP microparticles by tailoring the hydrophobicity and interfacial affinity of the co-surfactant. By using this strategy, the thermo-inert PS- b -P2VP self-assembled into pupa-like microparticles at T = 10 °C and pH 7.5, which could transform into tulip-like microparticles when T was increased to 50 °C. When the pH value was increased to 11, the pupa-like particles turned into onion-like microparticles although the PS- b -P2VP was inert to alkali. However, the pupa-like microparticles remained unchanged when both T and pH were simultaneously increased. The PAA- b -PNIPAM-grafted Fe 3 O 4 NP surfactants showed obvious advantages over the linear PAA- b -PNIPAM surfactants in modulating the morphology transition, since the linear PAA- b -PNIPAM could not induce the reversible shape transition of microparticles. Our work provides an efficient strategy to achieve reversible shape transformation of BCP microparticles while the internal phase structure is preserved, which may be utilized to switch the structural color properties of BCP microparticles.
研究领域:
高分子化学
·
纳米材料
·
智能响应材料
·
胶体与界面科学
·
功能材料
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2017
·
IF 5.835
Xiao Wang,Jiamin Zhou,Xiaoqing Lv,Baohua Zhang,Zesheng An
Aqueous dispersion polymerization of diacetone acrylamide (DAAM) by chain extension from a hydrophilic poly(N,N-dimethylacrylamide) (PDMA30) macromolecular chain transfer agent (macro-CTA) to produce PDMA30–PDAAMx block copolymer nano-objects was investigated in detail by systematically varying solids content and degree of polymerization of the core-forming PDAAM, leading to the formation of pure lamellae, mixed lamellae/vesicles, and pure vesicles as revealed by dynamic light scattering (DLS), transmission electron microscopy (TEM), atomic force microscopy (AFM), and scanning electron microscopy (SEM). PDMA30–PDAAMx lamellae were found to span an unprecedented wide space in the morphology phase diagram. Moreover, in situ cross-linking of lamellae via statistical copolymerization of DAAM with an asymmetric cross-linker allyl acrylamide and the effect of cross-linking density on the colloidal and morphological stabilities were studied, representing the first report on in situ cross-linking of lamellae during polymerization-induced self-assembly (PISA). Finally, reversible, temperature-induced morphological transitions from lamellae to worms/spheres on cooling were investigated by DLS, TEM, 1H NMR spectroscopy, and rheology. The kinetics of the temperature-dependent morphological transitions and the rheological properties could be tuned by the cross-linking density.
研究领域:
高分子化学
·
材料科学
·
胶体与界面化学
✓ 已验证
产品关联
DOI
高影响因子
Matter
·
2025
·
IF 17.5
Jun Liu,Jianen Zhang,Qi Xue,Huiying Gao,Shirui Zhang,Jinfeng Xie,Li Guan,Xiaohong Zhang,He Huang
The development of high-performance transparent conductors (TCs) is critical for advancing transparent electronics and optoelectronic devices. While n-type TCs are well established, the development of p-type TCs remains hindered by the limited availability of suitable materials. In this study, the layered double perovskite Cs 4 ZnBi 2 Cl 12 was synthesized as a promising p-type TC, which exhibits a wide direct band gap of 3.56 eV and intrinsic p-type conductivity. A hydration-mediated strategy was developed to trigger a near-spherical nanocrystal-to-nanorod transformation and modulate the electronic structure. First-principles calculations clarify that the lattice compressive strain induced by hydration significantly reduces the hole effective mass while increasing conductivity from 8.99 to 9.21 mS cm −1 , outperforming traditional p-type TCs, such as CuAlO 2 (3.4 mS cm −1 ) and SrCu 2 O 2 (0.48 mS cm −1 ). These findings not only provide experimental validation of the theoretical predictions regarding Cs 4 ZnBi 2 Cl 12 as a p-type TC but also establish a hydration strategy for optimizing the optical and electrical performance of layered double perovskites.
研究领域:
材料科学
·
光电子学
·
凝聚态物理
·
纳米材料
·
电子结构理论
✓ 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）