OPTICAL MATERIALS
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2022
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IF 3.754
Jian Lu,Hui Lin,Ruijin Hong,Dawei Zhang
By the solid phase reaction method, pure KNN and KNN with different proportions halloysite nanotubes (HNTs) were prepared to study the photocatalytic hydrogen evolution performance under the UV light irradiation. The band gaps of KNN with HNTs are narrower than that of pure KNN. The absorbance of KNN in the ultraviolet region is significantly enhanced by the incorporation of HNTs, where the absorbance in the 200-300 nm region increased about 2 times. Compared with KNN, the conduction band edge of KNN-5wt%HNTs reduced from −1.13 eV to −1.18 eV, showing stronger reducing ability. The H 2 production rate of KNN with HNTs is much higher than that of the raw KNN without HNTs. The best H 2 production rate of KNN-5wt%HNTs is 31.28 μmol•g −1 •h −1 , approximate 4.48 times as high as the rate of pure KNN (6.98 μmol•g −1 •h −1 ), suggesting appropriate addition of HNTs can efficiently improve the H 2 production efficiency.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2024
·
IF 3.9
Xianzhao Zhang,Qiyi Yin,Hengwen Cheng,Ruihua Zheng,Hui Zhang,Kunhong Hu,Fei Lin,Liping Fang,Shicheng Wang,Zhen Zhang
In this study, new lead-free piezoelectric ceramics (1 − x )(K 0.5 Na 0.5 )NbO 3 (KNN)– x (Bi 0.45 Y 0.05 )Na 0.5 ZrO 3 (BYNZ) were prepared using the conventional solid-state method, and the relation between the doping amount of (Bi 0.45 Y 0.05 )Na 0.5 ZrO 3 and its structural and electrical properties was investigated. Material characterization and structural analyses conducted using X-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy revealed that KNN–BYNZ ceramics formed single perovskite structures at 0 ≤ x ≤ 0.05 and a polycrystalline phase boundary (PPB) for the coexisting orthorhombic and tetragonal phases at 0.03 ≤ x ≤ 0.05. The ceramics exhibited desirable electrical properties at x = 0.04 ( d 33 = 305 pC/N, k p = 45.8 %, ε r = 1316, tanδ = 2.4 %, T c = 332 °C, P r = 28.2 μC/cm 2 , and E c = 1.07 kV/mm). These findings reveal that the introduction of BYNZ enables the effective formation of a PPB in the KNN-based ceramics to improve their electrical properties, and they exhibit potential for replacing lead-based piezoelectric ceramics in the market.
研究领域:
材料科学
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物理学
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Chenxi Liu,Zhonghua Dai,Yuanyuan Zheng,Xujun Li,Muhammad Nasir Rafiq,Shinya Tsukada,Yu Cong,Tomoaki Karaki,Shun Zhou
Potassium niobate sodium-based ceramics with unique optical and electrical properties are used to develop transparent energy storage capacitors. The (1- x )K 0.5 Na 0.5 NbO 3 - x Bi(Sr 0.5 Hf 0.5 )O 3 (KNN-BSH, x = 0, 0.025, 0.05, 0.075, 0.1) ceramics are prepared and intensively investigated in this work. The results show that the average grain of KNN-BSH ceramics reaches a minimum of 0.64 μm, owing to the effective suppression of grain growth by (Sr 0.5 Hf 0.5 ) 3+ doping at the B-site. The KNN-BSH ceramics exhibit pseudo-cubic phases and are excellent relaxation ferroelectric ceramics. In particular, the total energy storage density ( W total ) of 0.95KNN-0.05BSH ceramic is 3.94 J/cm 3 , the recoverable energy storage density ( W rec ) is 2.85 J/cm 3 , and the discharge time ( t 0.9 ) is 0.92 μs, which is optimal for comprehensive performance. Besides, the band gap of 0.975KNN-0.025BSH reaches a maximum value of 3.13 eV with a high transmittance of about 57.3 % at a wavelength of 950 nm. The results indicate that KNN-BSH ceramics can be an alternative for transparent energy storage materials.
研究领域:
材料科学
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电介质物理学
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产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2019
·
IF 2.752
Dafeng Zhang,Changhua Su,Hong Li,Xipeng Pu,Yanling Geng
Ag 2 O/K 0.5 Na 0.5 NbO 3 (Ag 2 O/KNN) piezophotocatalysts with different weight ratios of Ag 2 O to KNN were synthesized by a facile two-step method involving hydrothermal and precipitation methods. Ag 2 O particles were attached on the surface of KNN via a precipitation method. Ag 2 O/KNN composites exhibit better photoactivity than pure Ag 2 O and KNN under visible light irradiation. Moreover, under both irradiations of visible light and ultrasound, the piezophotocatalytic activity was further enhanced in comparison with photoactivity. Based on the experimental results, the improved piezophotocatalytic activities of Ag 2 O/KNN composites should be attributed to the formation of p-n heterojunction between Ag 2 O and KNN and the generation of external electric field of KNN, which leads to high separation rate of photo-induced charges. The photostability and corresponding piezophotocatalytic mechanism were discussed.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·Vol. 45
·期 17
·22486-22492
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IF 3.45
An Zhang,Zhiyong Liu,Xinhui Geng,Wenfeng Song,Jinshan Lu,Bing Xie,Shanming Ke,Longlong Shu
Piezoelectric catalysis is the catalytic action driven by the force-electrical conversion of piezoelectric materials . In this paper, the piezoelectric activity of K 0.5 Na 0.5 NbO 3 (KNN) was thoroughly investigated by annealing KNN at a series of temperatures and poling KNN under different electric-fields. With the application of an ultrasonification, the degradation activity for the Rhodamine B (RhB) dye molecules of the poled KNN was 253% higher than that of unpoled samples. The piezocatalytic activity of the poled KNN was significantly improved, which stemmed from the orderly ferroelectric domain to effectively reduce the recombination rate of the carriers by the built-in electric field. In addition, the superior piezocatalytic activity was achieved at KNN materials with the average grain size of ~0.29 μm, and after 160 min of mechanical vibration , the degradation rate of RhB (~5 mg/L) was as high as 95.7%. The high mechanical catalytic degradation rate of KNN materials reveals a bright application prospects in vibration catalytic degradation of organic pollutants .
研究领域:
材料科学
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压电催化
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环境修复
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功能陶瓷
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纳米材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 30
·64186-64195
·
IF 5.6
Mingchun Li,Yubin Kang,Zhi Wen,Yichen Zhu,Jing Su,Qiangqiang Zhu,Yue Zhai,Le Wang
Due to their potential applications in optical information storage, optical switches, and related fields, transparent photochromic materials have attracted significant attention. However, most current studies on rare-earth-doped K 0.5 Na 0.5 NbO 3 (KNN)ceramics focus on macroscopic photochromic phenomena, while in-depth investigations into the underlying microscopic mechanisms remain limited. This study fabricated Sm 3+ -doped K 0.5 Na 0.5 NbO 3 transparent ceramics using a high-temperature solid-state method at various sintering temperatures and systematically investigated the influence of sintering temperature on their microstructure, optical transmittance, and photochromic behavior to gain deeper insight into the essence of photochromism. Compared to previous studies that primarily addressed luminescence or visual color changes, this study combines X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) lifetime analysis, and thermal cycling to elucidate the formation and role of vacancy-trapped electron centers. The results showed that the ceramics exhibited maximum transmittance values of 44 % and 60 % at 597 and 900 nm, respectively, at a sintering temperature of 1185 °C. A transmittance modulation ratio of 23 % at 597 nm was achieved at 1170 °C. Alternating light and thermal stimuli enabled reversible modulation of luminescence intensity and transmittance, demonstrating excellent stability and repeatability. X-ray photoelectron spectroscopy revealed that photo-induced color centers formed by vacancy-trapped electrons reduced the transmittance and emission intensity, elucidating the intrinsic photochromic mechanism. Therefore, these ceramics showed strong potential for applications in optical data storage and nondestructive optical readout.
研究领域:
材料科学
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光学
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陶瓷
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稀土掺杂
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功能材料
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Lu Chunxiao,Zhao Ye,Zhang Qiwei,Li Shuai,Li Pengyu,Guo Yu,Li Yong,Zhang Liwen,Hao Xihong
Transparent ferroelectric ceramics, emerging as innovative photoelectric multifunctional coupling material, demonstrate significant potential for applications in optical storage and smart windows. However, achieving high transparency via manipulation of the preparation process, microstructure, and phase structure poses a considerable challenge. Here, we employ multiple strategies, including the fabrication technology regulation and donor doping of La 3+ and Tb 3+ at the A-site of K 0.5 Na 0.5 NbO 3 to fabricate exceptional transparent ceramics coupled with multi-mode reversible modulations of transparency, photochromism, and photoluminescence. This research offers a novel perspective on the design of transparent multifunctional materials.
研究领域:
材料科学
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功能陶瓷
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光电耦合材料
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固态化学
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智能窗口材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Pengyu Li,Qiannan Jia,Pei Han,Chunxiao Lu,Peng Li,Yong Li,Qiwei Zhang,Xihong Hao
Photon-mode ultracapacity storage media made of inorganic photochromic luminescent materials are highly anticipated, and widely explored in the development of new optical data storage (ODS) technologies. Despite some recent breakthroughs, the optical storage capacity of defect-rich photochromics is still limited to low luminescent readout abilities. Herein, oxygen vacancy rich and bismuth doped K 0.5 Na 0.5 NbO 3 :Eu 3+ ceramics were designed, and synergistically boost the luminescence intensity, photochromic efficiency, and luminescent modulation properties, then effectively improving the luminescence readout abilities. The luminescence modulation ratio reaches up to 97.5% from 68.4% with the increase of oxygen vacancy concentrations due to hetero-valent bismuth doping, accompanied by high photochromic efficiency (35.7% from 21.9%) and excellent reproducibility. These results demonstrate that the synergistic engineering of oxygen vacancy and doping is a promising strategy for obtaining high-performance photochromic materials.
研究领域:
材料科学
·
光学存储技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jingwen Lv,Simeng Song,Yan Jiao,Zhaoyu Yang,Yilin Zhang,Yingjie Fan,Chunlin Song,Gang Liu
A novel strategy of enhancing the dielectric and energy storage properties of Na 0.5 Bi 0.5 TiO 3 –BaTiO 3 (NBT–BT) ceramics by introducing a K 0.5 Na 0.5 NbO 3 (KNN) ferroelectric phase is proposed herein, and its underlying mechanism is elucidated. The lead-free KNN ceramic decreases the residual polarisation and increases the electric breakdown strength of the NBT–BT matrix through the simultaneous modification of its A-sites and B-sites. The obtained NBT−BT− x −KNN ceramics have a perovskite structure with unifying grains. A bulk 0.9NBT–BT–0.1KNN ceramic sample with a thickness of 0.2 mm possesses a high energy storage density of 2.81 J/cm 3 at an applied electric field of 180 kV/cm. Moreover, it exhibits good insulation properties and undergoes rapid charge and discharge processes. Therefore, the obtained 0.9NBT–BT–0.1KNN ceramic can be potentially used in high-power applications because of its high energy density , good insulation properties, and large discharge rate.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Nano Today
·
2024
·
IF 13.2
Cairong Xiao,Lei Fan,Changhao Li,Lei Zhou,Chunlin Deng,Rumin Fu,Dafu Chen,Zhengao Wang,Jinxia Zhai,Guoxing Tan,Peng Yu,Chengyun Ning,Chuanbin Mao
Bioelectrical homeostasis plays critical roles in biological processes, but disturbing it for cancer therapy remains challenging due to the difficulty in electrically controlling cancer cells. Here we show that cell-internalized electroactive nanoparticles interrupt it in cancer cells to effectively treat cancer wirelessly. Specifically, K 0.5 Na 0.5 NbO 3 ferroelectric nanoparticles are polarized and then generate a voltage of approximately −60 mV in response to ultrasound. Hence, once endocytosed by cancer cells in tumors, these nanoparticles establish an intracellular electric field (iEF) under the remote activation by ultrasound irradiation (for only 3 min) from outside the body. The iEF then depolarizes cell membrane potentials, decreases mitochondrial membrane potentials, and overloads intracellular calcium ions, disturbing intracellular bioelectrical balance. This disturbance promotes cancer cell apoptosis, inhibiting the growth of different types of tumors (bone tumor and skin tumor) without adverse effects. It is noteworthy that iEF can specifically disrupt the bioelectric balance of tumor cells but has no effect on normal cells. Such wireless cancer therapy can be achieved by other ferroelectric nanoparticles (e.g., BaTiO 3 ). This work represents the first cancer treatment paradigm by intracellularly interrupting bioelectrical homeostasis remotely to cause cancer cell dysfunctions without electrode implantation and wire connection in vivo. It can also provide biologists with new tools for studying the role of disturbed bioelectrical homeostasis in cell fates and disease progression.
研究领域:
癌症治疗
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纳米技术
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生物医学工程
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细胞生物学
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超声技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Jianmao Zheng,Jiyuan Zuo,Cairong Xiao,Qining Guo,Xiaobin Fu,Chengyun Ning,Peng Yu
The induction of dental pulp stem cells (DPSCs) into odontogenic differentiation is a cutting-edge method of dental pulp regeneration treatment. However, it remains a challenge to develop biomaterials and therapies that can induce odontogenic differentiation. Here, we propose a wireless electrical stimulation strategy to induce DPSCs odontogenic differentiation via K 0.5 Na 0.5 NbO 3 piezoelectric nanoparticles (KNN) and polarized KNN (PKNN), which can be endocytosed by DPSCs. In vitro, several odontogenic differentiation indexes were also increased in DPSCs treated with KNN and PKNN, and the increase was more obvious in the PKNN group. Intracellular wireless electrical field promoted mitochondrial calcium concentration via mitochondrial calcium unidirectional transporter (MCU), increased the production of adenosine triphosphate (ATP), and induced odontogenic differentiation through the activation of the cAMP-PKA signaling pathway. In vivo, dental pulp-like tissue was induced by electrical stimulation wirelessly with KNN and PKNN, which was more clinically friendly compared with the wired device, and the induction was more obvious in the PKNN group consistent with in vitro experiments. In conclusion, this work demonstrates the potential of PKNN as an effective stimulus that can induce odontogenic differentiation of DPSCs and be applied to dental pulp regeneration treatment.
研究领域:
牙科学
·
生物材料
·
干细胞生物学
·
纳米技术
·
再生医学
✓ 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）