CRYSTENGCOMM
·
2014
·Vol. 16
·期 47
·10750-10753
·
IF 3.858
Lingqing Dong,Kui Cheng,Wenjian Weng,Weiqiang Han
In this communication, strontium titanate (SrTiO3) nanocrystals with tailored surface structures have been synthesized by the hydrothermal method using potassium hydroxide (KOH) and lithium hydroxide (LiOH) as the mineralization agents. The results show that the surface structure adjusted by introducing different mineralization agents dictates not only the corresponding size and shape but also the dielectric properties of the obtained SrTiO3 nanocrystals.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 24
·245702
·
IF 3.551
Yongfei Cui,Huanhuan Sun,Peng Guo
Strontium titanate (SrTiO3) with perovskite structure has recently received significant attention in t he area of photocatalysis. However, challenges remain relating to its industrial applications; the high charge carrier recombination rate and low light-harvesting efficiency being the main two. Herein, a novel strategy based on fabrication of a typical n-p heterojunction has been proposed and the typical narrow-bandgap p-type semiconductor Ag2O was chosen to be coupled with SrTiO3 using a facile chemical precipitation method. The phase compositions, microstructures and optical properties of the prepared SrTiO3/Ag2O heterostructured photocatalysts have been systematically investigated with an x-ray diffractometer, scanning electron microscope, high resolution transmission electron microscope, x-ray photoelectron spectroscope and UV–vis spectrophotometer. The photocatalytic properties were evaluated through photodegradation of a common organic dye Rhodamine B (RhB). The results demonstrated that the heterostructured photocatalyst SrTiO3/Ag2O-0.15 outperformed pristine SrTiO3 and Ag2O. Specifically, the reaction rate of SrTiO3/Ag2O-0.15 is about 69 times and 4 times that of bare SrTiO3 and Ag2O respectively in photodegradation of RhB. The excellent photocatalytic performance was attributed to the synergetic effect between the improved visible-light harvesting efficiency and inhibited electron–hole recombination rate arising from the built-in electric field in a p-n heterojunction, as evidenced by the transient photocurrent and photoluminescence spectrum investigation. Furthermore, the excellent recyclability of the heterostructured photocatalyst was confirmed and holes were verified to be the major active species contributing to the overall degradation. Our findings demonstrate construction of p-n heterojunctions with narrow-bandgap semiconductors as a feasible avenue to promote overall photocatalytic efficiency, through simultaneously boosting charge-carrier separation and expanding photon-absorption range.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2013
·
IF 4.187
Chenyu Ye,Jiaxi Xu,Shuxue Zhou,Min Chen,Limin Wu
This paper presents a facile method to synthesize monodisperse SrTiO3 hollow spheres with one or two openings through a template-assisted approach. These hollow spheres were further self-assembled into densely packed nanofilms at a “hexane–water” interface. TEM, SEM, HRTEM, XRD, etc., were employed to characterize the morphology and structure of the SrTiO3 hollow spheres as well as the corresponding nanofilms. The nanofilm-based photodevice displayed considerably higher sensitivity to UV than visible light and dark.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOID AND POLYMER SCIENCE
·
2025
·
IF 2.3
Khan Muhammad Zeeshan,Alsaif Faisal,Aslam Farooq
Due to advancements in modern industry, typical high-voltage epoxy (Ep) insulation is inadequate for high temperatures and elevated voltages. To overcome this issue, Ep resin/strontium titanate (SrTiO 3 ) nanocomposites were synthesized to mitigate insulating flaws. Nano-SrTiO 3 was modified using the silane coupling agent KH550. The alterations in the molecular chain following the addition of modified nano-SrTiO 3 were assessed using FTIR. T g confirms that Ep resin/(SrTiO 3 ) nanocomposites, at an appropriate filling level, reduces inter-particle distances and increase the amount of immobile Ep areas inside the nanocomposite, hence elevating the glass transition temperature. The incorporation of nano-SrTiO 3 has an obvious effect on both the dielectric constant and dielectric loss of composites. The DC breakdown strength improved with the addition of modified nano-SrTiO 3 , which created deeper traps inside the bulk matrix. Furthermore, the rise in temperature leads to the creation of an electron avalanche, which diminishes charge suppression and hence reduces DC breakdown strength. The DC conductivity decreased after the addition of modified nano-SrTiO 3 into Ep resin. Moreover, the addition of modified nano-SrTiO 3 into Ep resin elevates the partial discharge initiation voltage, hence preventing discharge dispersion prior to reaching flashover. Additionally, reduced temperature significantly impacts the partial discharge inception voltage (PDIV) by lowering the kinetic energy of the charge, prolonging the de-trapping process along the surface and consequently increasing PDIV. Graphical abstract
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 8
·1812
·
IF 3.1
Wanlu Xu,Wenwu Wang,Xiaoshan Zhang,Ping Yu
Positive temperature coefficient of electrical resistivity (PTCR) materials with low Curie temperature have been paid increasing attention lately. In this study, PTCR materials with a Curie temperature of approximately −15 °C were investigated by La3+doping Ba0.55Sr0.45TiO3ceramics. It could be expected to meet the requirements of thermal management systems for low-temperature control. In addition, a trace amount of Bi0.5Na0.5TiO3(BNT) was employed to improve the resistivity and the PTCR performance. A significant PTCR effect was achieved with a high resistivity jump of nearly four orders of magnitude, a high temperature coefficient of ~28.76%/°C, and a narrow transition temperature span of 22 °C in the (Ba0.55Sr0.45)0.99875La0.00125Ti1.01O3-0.0025Bi0.5Na0.5TiO3ceramics. The PTCR enhancement mechanism of BNT is discussed.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2012
·
IF 1.751
Wanfang Liao,Ruihong Liang,Genshui Wang,Fei Cao,Xianlin Dong
Ba 0.6 Sr 0.4 TiO 3 (BST)/MgO columnar composites are fabricated via the spark plasma sintering (SPS) method. The microstructure, dielectric and tunable properties of columnar composites are investigated. The unmodified BST Curie temperatures with the increase of MgO addition indicate a sufficient suppression of ions interdiffusion between the two phases. The dielectric constant is decreased from 7000 to 3800 when MgO weight ratio is up to 15% while the tunability still stays at high level over 45%. The coefficient of the dielectric nonlinearity β shows a growing trend with increasing MgO content. The experimental results are in agreement with the theoretical prediction and confirm that if the composite is fabricated in columnar model, a reduction of dielectric constant without a deterioration of tunability could be achieved, which make them useful for potential tunable device applications in wireless communication system.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jia Wang,Le Xin,Mingwei Zhang,Ruihang Li,Pengchao Shao,Panpan Lyu,Hui Peng,Luchao Ren,Cuncheng Li,Jiwei Zhai
(1- x )Ba 0.5 Sr 0.5 TiO 3 - x CaAl 4 O 7 composite ceramics were prepared by solid-phase reaction method. The effects of ion diffusion and composite effects on the microwave dielectric properties of composite ceramics are analyzed in detail. The results show that as the CaAl 4 O 7 content increases, the ion diffusion intensifies, resulting in the weakening of the lattice vibration intensity of the composite ceramics and the weakening of the anharmonic vibration of Ti 4+ . Thus, the Curie peak moves toward low temperature and the tunability of the composite ceramic decreases. In addition, the difference in the influence of monoclinic structure and spinel structure on the tunability of BST ceramics is related to the degree of inhibition of BST grain growth by the two. With the continuous increase of CaAl 4 O 7 content, the composite effects became prominent, which effectively reduced the dielectric permittivity and significantly increasing the Q value of the ceramic sample. When x = 15 wt%, a composite ceramic with good microwave dielectric properties is obtained: ɛ r = 298, Q = 294 (2.953 GHz), and the tunability is 12 % (20 kV/cm).
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhuogen Li,Gangqiang Zhu,Weibin Zhang,Lujun Zhu,Baowei Cao,Jianzhi Gao,Xianjin Shi,Yu Huang,Peng Liu,Mirabbos Hojamberdiev
In recent years, metal–semiconductor heterojunctions have been intensively researched in the field of photocatalysis due to the effective spatial separation of photo-induced electron-hole pairs. Here, the dual-functional copper (Cu 0 /Cu 2+ )-modified SrTiO 3-δ nanosheets (Cu/STCO) are successfully synthesized by a two-step route. First, Cu 2+ -doped SrTiO 3-δ (STCO) nanosheets are synthesized by a hydrothermal method and then Cu 0 nanoparticles (NPs) are in situ formed from the STCO under H 2 atmosphere at 500 °C. The optimized ratio 6 %-Cu/STCO photocatalyst exhibits the best photothermal catalytic performance for CO 2 reduction reaction (CO 2 RR) and H 2 evolution performance. The detailed characterization demonstrate that the Cu 2+ dopant extend the light absorption range and the in situ generated Cu 0 NPs effectively improve the separation ability of photogenerated charge carriers by forming the Schottky contact with STCO. The excited localized surface plasmon resonance (LSPR) effect of metallic Cu 0 in Cu/STCO shows a considerable catalysis performance even under 600 nm monochromatic light irradiation. The density functional theory (DFT) calculations suggest that the Cu/STCO diminishes the barrier of the rate-determining steps of the CO 2 RR and H 2 evolution thus perform the outstanding catalysis ability in two filed. This work presents the synergistic effect of Cu 0 and Cu 2+ on enhancing the photothermal catalytic performance for CO 2 RR and H 2 evolution and offers a novel strategy to synthesize the metal–semiconductor nanostructures for efficient harnessing of solar energy into fuel.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Feiyang Hong,Honglian Wang,Xiaoyi Ma,Minggang Yang,Haitao Zhang,Yang Ma,Kai Yang,Xiaobing Zhao,Guocheng Wang
Implant-associated infections present a significant clinical challenge, exacerbated by the increasing prevalence of antibiotic resistance associated with conventional antibiotic therapies. Photoresponsive antibacterial strategies offer a promising alternative, but their effectiveness in treating deep tissue infections is often limited by the short wavelengths required for activation of most photosensitizers. This study reports the development of a strontium titanate (STO) metastructure coating on titanium alloy implants, engineered for long-wavelength photoresponsive antibacterial activity. We demonstrate that the size of the STO metastructure particles is precisely controlled by modulating the Sr(OH)₂ precursor concentration, enabling tunable optical responses within the 800 nm–1600 nm wavelength range. The resulting coating exhibits excellent antibacterial efficacy upon irradiation with second near-infrared window (NIR-II) light (1064 nm), while demonstrating good biocompatibility and minimal damage to healthy cells after NIR exposure.
研究领域:
生物医学工程
·
材料科学
·
感染与免疫
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Jiejing Kong,Zebao Rui,Hongbing Ji
Construction of versatile multijunctions with visible light response, effective charges transport and separation, suitable band positions, and good stability is highly expected for the photocatalytic VOCs degradation. Herein, one-dimensional titania nanotube supported SrTiO3 heterostructure (STO/TN) was developed by a hydrothermal process and then simultaneously sensitized with carbon nitride polymer (CN) and doped with nitrogen (CN-STO/TN) for photocatalytic mineralization of toluene. CN-STO/TN simultaneously exhibits the following advantages: (1) the nanotube structure enhances light-harvesting, enables effective charges transport and separation, retains sufficient energy of the charges, facilitates the pollutant species transport and reactants enrichment by the confinement effect; (2) synergistic effect of CN sensitization and N-doping extends the light response to the visible light region; (3) multichannel charges separation and transport among the multijunctions promote the photogenerated carriers separation. These beneficial factors lead to the remarkably higher visible light photocatalytic performance of CN-STO/TN in comparison with the component photocatalysts, 27 times that of TN, 13.5 times that of STO, and 4.9 times that of CN, respectively. These results demonstrate that the combination of morphology tailoring and energy band alignment manipulation is important in designing effective heterojunctions for photocatalytic applications.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Nano Energy
·
2023
·
IF 17.6
Yawei Jiang,Fenghui Li,Xuhui Li,Wenjian Fang,Xiaodong Si,Tao Zhou,Yulin Min,Yongsheng Liu
The combination of piezoelectric catalysis and photocatalysis has garnered significant attention in the fields of pollutant degradation and water splitting. However, the charge carrier transport property remains unclear due to the difficulty in observing nanocrystal polarization during the reaction process. This study aimed to address this issue by preparing Ba 1−x Sr x TiO 3 (BST) solid solutions using the solid-phase method and examining the effect of ion doping on piezoelectricity-photocatalytic activity. The photocatalysis and local piezoelectric catalysis coupling was evaluated through water decomposition and dye degradation. Interestingly, the introduction of local piezoelectric catalysis had the opposite effect: it reduced photocatalytic hydrogen production but increased the rate of photocatalytic RhB degradation. The possible mechanism was proposed that the different adsorption of H + and radicals on the catalysts would affect the direction of the local piezoelectric potential and then change the photo-generated carriers' transfer path.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Acta Biomaterialia
·
2024
·
IF 9.4
Yunyun Wu,Yanjing Wang,Weili Li,Diyi Li,Panpan Song,Yaqing Kang,Xiaoqing Han,Xinbo Wang,Hongkun Tian,Abdur Rauf,Jiao Yan,Haiyuan Zhang,Xi Li
Piezoelectric, conductive, and injectable hydrogel (SPG hydrogel) is constructed to rapidly close wounds, efficiently harvest biomechanical energy from animal motion, and generate electrical stimulation for electrotherapy of wound healing. 3-amino-4-methoxybenzoic acid (AMB) monomer was polymerized and grafted onto the gelatin, which was further crosslinked using EDC/NHS and embedded with strontium titanate nanoparticles (80.5 wt%), forming SPG hydrogel. This SPG hydrogel had high tissue adhesion ability, and could generate the output voltage (maximum output voltage 1 V) and current (maximum output current 0.5 nA) upon mechanical bending, promoting NIH-3T3 cell migration and proliferation. Upon application to the mice wound model, the SPG hydrogel rapidly closed the skin wound, smoothed the wound's appearance, reduced the remaining wound size, and increased epidermal thickness, demonstrating remarkable wound healing capabilities. This study suggests that the body motion-promoted electrotherapy offers a promising strategy for wound healing. Statement of significance Piezoelectric nanomaterials are often incorporated into hydrogels to create piezoelectric hydrogels for wound healing. However, piezoelectric nanomaterials tend to agglomerate within the hydrogel matrix, and the hydrogel's low conductivity hinders efficient electron transfer. Together, both factors significantly reduce the piezoelectric effect. In this study, we developed an SPG hydrogel to improve the homogeneity and conductivity of the piezoelectric hydrogel. We first designed a conductive PG hydrogel and then immoblized piezoelectric STO nanoparticles within its matrix through coordination chemistry. Upon mechanical deformation, the uniformly distributed STO nanoparticles can generate electricity, which can efficiently transfer through the conductive matrix to the hydrogel's surface. This design shows great potential for wound healing applications.
研究领域:
生物材料学
·
组织工程
·
再生医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）