JOURNAL OF ELECTRONIC MATERIALS
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2021
·Vol. 51
·期 1
·214-222
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IF 1.938
Tian Chunxia,Tian Xi-ang,Li Yu,Wang Zhijun,Liu Li
Porous SnO 2 with high sensitivity and fast response has attracted much attention. Herein, we prepared 3D porous SnO 2 using carbon balls as a template and studied the effects of sintering time (1 h, 2 h, 3 h, 4 h) at a certain calcination temperature of 500℃ and Ho doping on the gas-sensing performance of 3D porous SnO 2 . The gas-sensing test results show that, compared with the samples obtained under other sintering time, the gas-sensing property of 3D porous SnO 2 calcined for 2 h has the highest gas sensitivity of 31 in the 50-ppm formaldehyde environment. Among the samples doped with Ho, 3D porous SnO 2 with a doping amount of 3.5% has the highest sensitivity of 65 at operating temperature of 230℃, which is twice as long as pure 3D porous SnO 2 with a calcination time of 2 h. Moreover, the sample has good selectivity, low detection limit, and good linearity. These excellent gas-sensing characteristics are mainly due to the unique morphology of 3D porous SnO 2 , more oxygen vacancies, and the influence of Ho doping. Therefore, the gas-sensing performance of the metal oxide semiconductor material can be further improved by forming the porous nanocomposite material. Graphical Abstract
(a) Response recovery time of SnO 2 obtained under different calcination times; (b) Response recovery time of SnO 2 doped with different Ho content.
研究领域:
材料科学
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纳米技术
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化学传感器
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2024
·Vol. 110
·期 3
·619-634
·
IF 2.3
Chen Yutong,Liu Wensheng,Ma Yunzhu,Yao Shuwei,Wang Juan
Continuous alumina fibers with excellent thermal stability are essential in high-temperature applications. In this study, 0~1 wt% Y 0.5 Er 0.5 Ho 0.5 Yb 0.5 O 3 were added to the alumina fibers to enhance thermal stability. The impact of Y 0.5 Er 0.5 Ho 0.5 Yb 0.5 O 3 addition on alumina fibers’ transformation and microstructure evolution of during the sintering process was systematically studied. The influence of single- and two-step sintering processes on the fiber microstructures was elucidated. The results suggested that adding Y 0.5 Er 0.5 Ho 0.5 Yb 0.5 O 3 impeded fiber densification, inhibited alumina grain growth, and enhanced the thermal stability of fibers. Using a two-step sintering process facilitated the achievement of fully dense alumina fibers with fine grains. The alumina fibers added with 1.0 wt% Y 0.5 Er 0.5 Ho 0.5 Yb 0.5 O 3 exhibited a remarkable strength retention rate of up to 93% after exposure to 1200 °C for 10 h. The TEM analysis revealed that rare earth elements segregation at α-Al 2 O 3 grain boundaries due to their larger radius than the Al element contributed to stabilizing the microstructures of α-Al 2 O 3 fibers at high service temperature. Graphical Abstract
研究领域:
材料科学
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高温材料
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陶瓷纤维
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热稳定性研究
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稀土掺杂技术
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DOI
高影响因子
ACS Photonics
·
2024
·
IF 6.5
Wenxia Wu,Yazhao Wang,Limin Wu,Huiting Zhang,Zhonghua Zhu,Shengdi Ta,Peng Zhang,Shoulei Xu,Bernard A. Goodman,Wen Deng
Under excitation at 980 nm, Tm3+ may emit ultraviolet, blue, and red light, and Ho3+ may emit green light through multiphoton upconversion processes in Yb/Tm/Ho codoped materials. However, because the probability of the electron population of the higher excited state energy levels is much lower than that of the lower ones in multiphoton upconversion processes, it is difficult to observe the ultraviolet emission of Tm3+-doped single crystals under excitation at 980 nm. Here, we report that high-quality single crystals of cubic ZrO2 codoped with Tm2O3, Ho2O3, and Yb2O3 are successfully grown by the optical floating zone method, and ultraviolet emission at 308 nm was observed for the first time from multiphoton upconversion transitions in these highly transparent, low phonon energy single crystals under excitation at 980 nm. This result demonstrates the prospect of making ultraviolet solid-state lasers pumped by near-infrared light. Moreover, bright white light was emitted from the single crystal prepared with 5.00 mol % Yb2O3, 0.75 mol % Tm2O3, 0.0075 mol % Ho2O3, 2.2425 mol % Y2O3, and 92.00 mol % ZrO2 under excitation at 980 nm, and a bright solid white light source excited by a near-infrared light-emitting diode for practical use is presented.
研究领域:
材料科学
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光学
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DOI
高影响因子
JOURNAL OF RARE EARTHS
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2024
·
IF 5.2
Zhigang Gao,Lugui Cui,Yushi Chu,Luyue Niu,Jing Xiao,Jing Ren
In this work, rare earth ions (REs) including Yb 3+ /Er 3+ , Yb 3+ /Ho 3+ and Yb 3+ /Tm 3+ co-doped manganese oxyfluoride glasses were fabricated using melt quenching method. By fully utilizing the upconversion luminescence (UCL) of REs and regulating energy transfer between the different energy levels of RE ions and the 4 T 1 level of Mn 2+ , the output of UCL was regulated and even pure-red light can be achieved. Moreover, owing to the selective partitioning caused by phase-separation network structure in the oxyfluoride glass, the UCL intensity of glasses annealed for 72 h is significantly enhanced 58 times compared to the rapidly quenched samples.
研究领域:
材料科学
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光学
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光子学
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DOI
高影响因子
Science China-Chemistry
·
2021
·Vol. 64
·期 4
·558-564
·
IF 9.445
Xue Dongzhi,Liu Yang,Jin Longhai,Wang Yinghui,Cui Fengzhi,Liu Jianhua,Li Xiaoqing,Zhang Songtao,Zhao Ying,Yin Na,Niu Rui,Wang Daguang,Zhang Hongjie
Because of the intrinsic defects of traditional treatment of cancer, it is quite needed to construct novel theranostic nanoagents that can not only improve the accuracy of imaging diagnosis but also achieve highly efficient therapy of cancer. Herein, we fabricated polydopamine-functionalized ammonium holmium fluoride nanocomposites (AHF@PDA) for dual-modality bioimaging (magnetic resonance imaging (MRI) and computed tomography (CT)) owing to the high X-ray attenuation feature and magnetic property of Ho 3+ . Moreover, PDA shell endows AHF@PDA with excellent photothermal conversion performances and robust biocompatibility, leading to good treatment effect in vitro and in vivo . All above positive results certify that AHF@PDA have good potential as theranostic agents for clinical application in the future.
研究领域:
纳米技术
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生物医学工程
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癌症研究
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医学成像
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产品关联
DOI
高影响因子
Acta Biomaterialia
·
2023
·
IF 9.7
Ruling Zhang,Meng Liu,Sitong Liu,Xiaotong Liang,Ruitao Lu,Xintao Shuai,Dalin Wu,Zhong Cao
Ultra-high-field (UHF) MRI has shown great advantages over low-field magnetic resonance imaging (MRI). Despite being the most commonly used MRI contrast agents, gadolinium chelates perform poorly in high magnetic fields, which significantly weakens their T 1 intensity. In comparison, the rare element Holmium (Ho)-based nanoparticles (NPs) have demonstrated great potential as T 2 -weighted MRI contrast agents in UHF MRI due to their extremely short electron relaxation times (∼ 10 −13 s). In this study, a multifunctional nanotherapeutic probe was designed for UHF MRI-guided chemotherapy and photothermal therapy. The Ho (III)-doped mesoporous polydopamine (Ho-MPDA, HM) nanosphere was loaded with the chemotherapeutic drug mitoxantrone (MTO) and then coated with 4T1 cell membranes to enhance active targeting delivery to breast cancer. The prepared nanotherapeutic probe MTO@HMM@4T1 (HMM@T) exhibited good biocompatibility, high drug-loading capability and great potential as Ho (III)-based UHF MRI contrast agents. Moreover, the biodegradation of HMM@T in response to the intratumor pH and glutathione (GSH) promotes MTO release. Near-infrared (NIR) light irradiation of HM induced photothermal therapy and further enhanced drug release. Consequently, HMM@T effectively acted as an MRI-guided tumor-targeting chemo-photothermal therapy against 4T1 breast cancer. Statement of significance Ultra-high-field (UHF) MRI has shown great advantages over low-field magnetic resonance imaging (MRI). Although gadolinium chelates are the most commonly used MRI contrast agents in clinical practice, they exhibit a significantly decreased T 1 relaxivity at UHF. Holmium exhibits outstanding UHF magnetic resonance capabilities in comparison with gadolinium chelates currently used in clinic. Herein, a theranostic nanodrug (HMM@T) was designed for UHF MRI-guided chemo-photothermal therapy. The nanodrug possessed remarkable UHF T 2 MRI properties (r 2 = 152.13 mM −1 s −1 ) and high drug loading capability of 18.4 %. The biodegradation of HMM@T NPs under triple stimulations of pH, GSH, and NIR led to an efficient release of MTO in tumor microenvironment. Our results revealed the potential of a novel UHF MRI-guided multifunctional nanosystem in cancer treatment.
研究领域:
医学成像
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纳米技术
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癌症治疗
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材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2024
·
IF 15.8
Qingqing Cheng,Yanzhou Chang,Dong Zhang,Xiangsheng Zhao,Zeyu Xiao,Tianfeng Chen,Changzheng Shi,Liangping Luo
Ultrahigh field magnetic resonance imaging (UHF-MRI) (≥7 T) can dramatically boost image resolution and signal-to-noise ratio, which have distinct advantages in multifunctional imaging. However, their research and application are currently limited by the absence of high-field contrast agents (CAs) and the low sensitivity and accuracy of T1/T2 single-modality CAs. Therefore, the development of T1–T2 dual-mode CAs that respond to UHF-MRI and nanoformulations with therapeutic sensitization can bring ideas for the integrated application of precise and synchronous tumor theranostics. Herein, we present a biomimetic mineralization strategy for synthesizing holmium/manganese oxide–bovine serum albumin–photosensitizer chlorin e6 nanohybrids. The hybrid nanoparticles exhibited better tumor accumulation, a suitable time imaging window, and excellent pH-response T1–T2 dual-mode UHF-MRI performance. The antitumor effect comes from the amelioration of the hypoxic tumor microenvironment to promote the synergistic effect of photodynamic therapy and radiotherapy, along with negligible acute toxicity. Undoubtedly, this work not only provides a different perspective for developing multifunctional nanotherapeutics but also promotes the potential clinical exploitation and translation of UHF CAs.
研究领域:
纳米技术
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磁共振成像
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癌症诊疗学
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材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Gels
·
2024
·Vol. 10
·期 12
·808
·
IF 5
Feng Li,Ruoxi Yang,Jian Xu,Guohai Xu,Ye Wu
The concentration of small molecules reflects the normality of physiological processes in the human body, making the development of simple and efficient detection equipment essential. In this work, inspired by a facile strategy in point-of-care detection, two devices were fabricated to detect small molecules via photocurrent measurement. A linear response of the photocurrent against the concentration of the small molecules was found. In the first device, metal ions were introduced into gel substrates made by xanthan gum to enhance photocurrent response. N-phenyl-2-naphthylamine was measured when iron or manganese ions were used. L-Phenylalanine was measured when the gel was modified by samarium, iron, cerium, or ytterbium ions. L-(+)-Arabinose was detected via the gels modified by iron or holmium ions. D-(+)-Mannose was detected when the gel was modified by ytterbium, manganese, chromium, or sodium ions. L-Methionine was detected in the gels modified by samarium, zinc, or chromium ions. The second device was based on a paper sheet. A sugar-like molecule was first synthesized, which was then used to modify the paper. The detection was possible since the photocurrent showed a linear trend against the concentration of D-Trehalose. A linear fit was conducted to derive the sensitivity, whose value was found to be 5542.4. This work offers a novel, simple, and environmentally sustainable platform that is potentially useful in remote areas lacking medical devices.
研究领域:
生物医学工程
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分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Electronic Materials
·
2026
·
IF 4.7
Shiqiang Yan,Kezhang Zhang,Zhenyang Qi,Qiang Zhang,Wenhao Fan,Shaoping Chen
Thermoelectric technology converts low-grade waste heat into electrical energy, offering an environmentally sustainable pathway for global development. N-type Mg3(Sb, Bi)2 thermoelectric materials have garnered significant attention due to their outstanding thermoelectric performance over broad temperatures (27–500 °C). However, unavoidable Mg loss and interfacial element diffusion degrade the performance and service life of thermoelectric devices, thereby limiting the application of thermoelectric technology. Here, we introduce elemental Mg into thermoelectric interfacial materials (TEiMs) to suppress harmful Mg diffusion and compensate for Mg loss within the material, achieving dual stability in Mg3(Sb, Bi)2 devices. After 30 days of aging, Mg3(Sb, Bi)2 single-arm devices maintained an outstanding power density of 0.75 W/cm2 and a remarkable conversion efficiency of 8.9%, demonstrating unprecedented stability. These findings offer design strategies for TEiMs and provide valuable references for interface engineering in diverse thermoelectric systems, thereby advancing the practical feasibility of thermoelectric energy harvesting in renewable energy and waste heat applications.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Chenglong Ma,Wei Sun,Waqas Qamar Zaman,Zhenhua Zhou,Hao Zhang,Qicheng Shen,Limei Cao,Ji Yang
Research has been focused on regulating the amorphous surface of Ir-based materials to achieve a higher oxygen evolution reaction (OER) activity. The IrOx amorphous layer is generally considered to be substantial enough to break the limitation created by the conventional adsorbate evolution mechanism (AEM) in acidic media. In this work, we used lanthanides to regulate IrOx amorphization–crystallization through inhibiting the crystallization of iridium atoms in the calcination process. The chosen route created abundant crystalline–amorphous (c-a) interfaces, which greatly enhanced the charge transfer kinetics and the stability of the materials. The mass activity of iridium in the synthesized IrO2@LuIr1–nOx(OH)y structure reached 128.3 A/gIr, which is 14.6-fold that of the benchmark IrO2. All the IrO2@LnIr1–nOx(OH)y (Ln = La–Lu) structures reflected 290–300 mV of overpotential at 10 mA/cmgeo2. We demonstrate that a highly active c-a interface possesses an efficient charge transfer capability and is conducive to the stability of the activated oxygen species. The surface-activated oxygen species and the tensile strain [IrO6] octahedron regulated by lanthanides are synergistically beneficial for increasing the intrinsic OER activity. Our research findings introduce c-a interface generation by the regulation of lanthanides as a new method for the rational design of robust OER catalysts.
研究领域:
材料科学
·
电化学
·
催化
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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）