Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 38
·6047-6056
·
IF 4.776
Xiyu Li,Qin Zou,Li Chen,Wei Li
Hydroxyapatite (HA) has been broadly used for the repair of human hard tissues due to its bioactivity and similarity to the mineral of bones and teeth. We prepared a fluorine (F), ytterbium (Yb) and holmium (Ho) ternary doped HA (HYH-F) material and investigated its dual functions of bone repair and multimodal tracking. The results showed that the HYH-F material could display clear X-ray micro-computed tomography (Micro-CT) images based on Yb ions, and Ho ions due to its superparamagnetic properties for magnetic resonance imaging (MRI), while the F ions could enhance the upconversion (UC) fluorescence of the Yb/Ho combination. The ternary doped HYH-F material shows good compatibility with cells and bone tissue. A joint usage of Micro-CT imaging and UC fluorescence imaging distinctly and synergistically demonstrated the distribution state and degradation of the HYH-F material during new bone reconstruction. The single matrix HA material with ternary doping will be beneficial for future biomedical investigation and applications, and it can not only be a bone repair biomaterial, but also provide lifelong multimodal tracking efficacy.
研究领域:
生物医学
·
材料科学
·
医学影像学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Huawei Li,Miao He,Senyao Meng,Ping Wang,Cheng Yang,Jiasai Yao,Zikang Hu,Zhenxing Li
The removal of acetylene (C2H2) impurities from ethylene (C2H4) is a critical step in the production of high-purity C2H4. Due to its low reaction temperature, low energy consumption and high selectivity for C2H4, the electrocatalytic semi-hydrogenation of C2H2 is an ideal method for removing C2H2. Herein, ultrathin two-dimensional (2D) mesoporous holmium oxide nanosheet-stabilized copper nanoparticles (Cu/Ho2O3) for stable and efficient electrocatalytic semi-hydrogenation of C2H2 were prepared through a simple and one-step high-temperature calcination-reduction method. The ultra-thin two-dimensional mesoporous structure of holmium oxide creates abundant coordination defects, improving the faradaic efficiency and durability of copper nanoparticles for catalyzing the semi-hydrogenation of C2H2. The as-prepared Cu/Ho2O3 achieved a C2H4 selectivity of 99.6% and a faradaic efficiency of 98.1% because the presence of oxygen vacancies is conducive to forming electron-rich Cu nanoparticles, thereby promoting the adsorption of electrophilic C2H2 and the desorption of nucleophilic C2H4. Meanwhile, the holmium oxide nanosheet with unsaturated coordination sites can stabilize the Cu nanoparticles, and the faradaic efficiency and current density remain stable for more than 600 minutes. This work offers a promising design strategy for a stable and efficient electrocatalyst for the semi-hydrogenation of C2H2 to C2H4.
研究领域:
材料科学
·
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Yuhao Li,Junhao Xu,Tengbo Hu,Guangli Shi,Yao Peng,Feng Qiao,Lietao Zhang,Chuanyu Zhao,Ye Kuang,Longhai Shen
Rare earth (RE) dopants can modulate the bandgap of oxides of indium and gallium and provide extra upconversion luminescence (UCL) abilities. However, relevant UCL fine-tuning strategies and energy mechanisms have been less studied. In this research, InGaO, Ho3+ monodoped and Yb3+/Ho3+ codoped In2O3, and Ho3+ monodoped Yb3Ga5O12 nanoparticles (NPs) were synthesized by a solvothermal method. The effects of Yb3+ and Ho3+ dopants on the crystal structures, UCL properties, and optical bandgaps of the oxides were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UCL spectroscopy, and measurements of decay times, pump power dependence, and transmittance spectra. The crystal structures of oxide products of indium and gallium were significantly modified with RE dopants. In2O3 and Yb3Ga5O12 were selected as the host materials. For Yb3+/Ho3+ codoped In2O3 NPs, there existed energy transfers from the defect states of In2O3 to Ho3+ and from Yb3+ to Ho3+. With a fixed Ho3+ concentration, In2O3:0%Yb3+,2%Ho3+ NPs showed the optimal UCL properties mainly due to In2O3–Ho3+ energy transfer and Ho3+–Yb3+ energy-back-transfer, while with a fixed Yb3+ concentration, In2O3:5%Yb3+,3%Ho3+ NPs with a slight Yb2O3 impurity and Yb3Ga5O12:2%Ho3+ NPs did mainly due to Ho3+–Ho3+ cross-relaxation. Besides, the optical bandgaps of In2O3 and Yb3Ga5O12 were noticeably broadened with RE dopants. These findings can offer feasible directions for the synthesis and UCL fine-tuning of RE-doped oxides of indium and gallium and improve their multifunction application prospects in the fields of semiconductor and UCL nanomaterials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Optical Materials
·
2023
·
IF 0
Yingzhen Wu,Lin Lin,Pan Lu,Wenjun Ma,Zheng Li,Mingze Zhang,Yuanming Yang,Niuniu Ju,Yanan Zhang,Huanjie Liao,Zhuohong Feng,Zhezhe Wang,Zhiqiang Zheng
Up until now, the applications of lanthanide ion-doped lead-free double perovskite Cs2AgInCl6 nanocrystals (NCs) have been rarely reported, especially in fluorescence anticounterfeiting and coding. Here, we successfully incorporated Tb3+/Ho3+ ions into Cs2AgInCl6 NCs by the hot-injection method. Benefiting from the energy transfer process, Tb3+- and Ho3+-codoped Cs2AgInCl6 NCs showed tunable emission color in a green-blue-orange triangle region. Combining our NCs with transparent ink for printing, we put forward the applications of color bar codes and color QR codes (3D codes) as well as information encryption. Compared with traditional codes, color bar codes and 3D codes conquer the shortcomings of low information density, weak information security, and poor aesthetics. Furthermore, through double-mode excitation, we list an encoding table corresponding to 26 letters and 10 numbers. The encoding table embodies the application value of information encryption and coding.
研究领域:
材料科学
·
光学
·
信息安全
✓ 已验证
DOI
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 21
·10191-10200
·
IF 3.925
Fang-Di Wu,Jyh-Cherng Chen,Zi-Tao Yang
A C/Ho co-doped TiO2 catalyst was prepared by the precipitation–calcination method using Ti3C2Tx as the precursor and carbon source. X-ray diffractometry, transmission electron microscopy, X-ray photoelectron spectroscopy, N2 adsorption–desorption isotherms, UV-Vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, and photoelectrochemical measurements were used for characterization. The C doped anatase TiO2 prepared by calcining Ti3C2Tx maintained the two-dimensional lamellar structure of the Ti3C2Tx precursor, and the carbon dopant was present on the surface of TiO2 in the form of C–O and CO, whereas Ho3+ was mainly doped into the lattice of TiO2, forming Ho–O bonds with oxygen instead of Ti4+. The band gap of the C/Ho co-doped TiO2 photocatalyst was reduced as compared to that of pristine TiO2, which can improve the utilization efficiency of visible light. When the doping ratio of Ho was 5% (CHT-0.05), the photocatalyst had the highest photocurrent and degradation efficiency of tetracycline hydrochloride (86.4%). The reaction mechanism for the photocatalytic degradation of TCH by the C/Ho co-doped TiO2 photocatalyst was investigated and showed that superoxide radicals (˙O2−) and holes (h+) were the main species that influenced the results. The prepared photocatalyst had good catalytic performance over four cycles, and it was stable and suitable for wastewater treatment.
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
OPTIK
·
2022
·
IF 2.84
Ying Chen,Xuegang Zheng,Haobo Lin,Meijuan Liu,Shusheng Pan,Zhiyu Liu,Tong Liu,Dekang Xu,Hao Lin
In the work, a range of Er 3+ -sensitized NaYF 4 upconversion (UC) particles doped with Tm 3+ and Ho 3+ are successfully prepared by hydrothermal process. The UC crystals appear two green emission peaks at 529 and 541 nm and a remarkable red emission peak at 655 nm under 980 and 1532 nm irradiations. Here, Tm 3+ and Ho 3+ serve as trapping centers, which confine the excitation energy efficiently to promote the red UC emission and improve the red to green ratio. UC mechanisms in the Er 3+ /Tm 3+ co-doped and Er 3+ /Ho 3+ co-doped NaYF 4 crystals are discussed at length based on the UC luminescence spectroscopy. Unlike the traditional sensitization with high Er 3+ concentration doping to obtain red light, the red UC luminescence is acquired by low Er 3+ concentration doping, which can effectively avoid concentration quenching caused by high Er 3+ concentration doping. Furthermore, NaYF 4 :Er 3+ , Tm 3+ crystals exhibit stronger red UC emission compared with NaYF 4 :Er 3+ , Ho 3+ counterparts. Er 3+ -sensitized NaYF 4 crystals doped with Tm 3+ and Ho 3+ ions generate pure red light more efficaciously under 1532 nm excitation than under 980 nm excitation. The phosphors emitting brilliant red UC emission have the potential applications in solid state lasers and biological imaging.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 9
·4812-4820
·
IF 7.79
Rong Huang,Songbin Liu,Jinshu Huang,Huiming Liu,Zhiyong Hu,Lili Tao,Bo Zhou
Photon upconversion is a fascinating phenomenon that can convert low-energy photons to high-energy photons efficiently. However, most previous relevant research has been focused on upconversion systems with a sufficiently low lanthanide emitter concentration, such as 2 mol% for Er3+ in an Er–Yb coupled system. Realizing the upconversion from lanthanide heavily doped systems in particular, the emitter sublattice is still a challenge. Here, we report a mechanistic strategy to achieve the intense upconversion of the holmium sublattice in a core–shell-based nanostructure design through interfacial energy transfer channels. This design allowed a spatial separation of Ho3+ and sensitizers (e.g., Yb3+) into different regions and unwanted back energy transfers between them could then be minimized. By taking advantage of the dual roles of Yb3+ as both a migrator and energy trapper, a gradual color change from red to yellowish green was achievable upon 808 nm excitation, which could be further markedly enhanced by surface attaching indocyanine green dyes to facilitate the harvesting of the incident excitation energy. Moreover, emission colors could be tuned by applying non-steady state excitation. Such a fine-tunable color behavior holds great promise in anti-counterfeiting. Our results present a facile but effective conceptual model for the upconversion of the holmuim sublattice, which is helpful for the development of a new class of luminescent materials toward frontier applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 13
·6313-6320
·
IF 6.7
Wang Sheng,Jinshu Huang,Zhiyuan Cai,Li He,Bo Zhou
2 μm mid-infrared (MIR) light sources have shown great potential for broad applications in molecular spectroscopy, eye-safe lasers, biomedical systems and so on. However, previous research studies were mainly focused on conventional materials such as glasses, glass-ceramics and crystals, limiting the luminescence intensity and miniaturization of photonic devices. Here we report a new strategy to realize the multiple excitation wavelength responsive MIR emission in a single nanoparticle by employing an erbium sublattice as the sensitizing host. Intense 2 μm emission of Ho3+ from its 5I7 → 5I8 optical transition was observed under 808, 980 and 1530 nm excitations. The possible energy transfer mechanism between Er3+ and Ho3+ ions was discussed. We also designed a core–shell–shell nanostructure by inserting an NaYF4:Yb interlayer to maximize the absorption of 980 nm photons and enhance the 2 μm emission. The MIR luminescence under 808 nm excitation can be further improved by introducing Nd3+ into the outermost shell and attaching indocyanine green dyes. These results present an efficient way for the development of MIR luminescent nanomaterials with great potential in the fields of MIR gain devices, nanosized MIR light sources, and nanophotonics.
研究领域:
纳米光子学
·
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Crystals
·
2024
·Vol. 14
·期 1
·79
·
IF 2.4
Xing Gao,Xin Song,Shan Zhang,Xinxiang Yang,Pei Han,Liwen Zhang,Chunxiao Lu,Xihong Hao,Yong Li
Self-powered photodetectors have the advantages of high sensitivity, sustainability, and small size and have become a research hotspot in advanced optoelectronic systems. However, the low output photocurrent density seriously hinders the practical application of ferroelectric self-powered photodetectors. Herein, the high-efficiency photoelectric detection performance of the Bi1-xHoxFeO3ferroelectric self-powered photodetector is realized by doping Ho. The responsivity (R) and detectivity (D*) can reach 0.0159 A/W and 1.94 × 1011Jones under monochromatic light with a wavelength of 900 nm. Meanwhile, the R andD*can reach 0.022 A/W and 2.65 × 1011Jones under sunlight. These excellent photodetection performances are attributed to the high short-circuit current density (Jsc). When the Ho content is 6%, the output photocurrent reaches up to 0.81 mA/cm2. The systematic structure and photo-electric characteristic analysis suggest that the decrease in the band gap leads to the generation of a larger photocurrent while the ferroelectric polarization is reduced slightly. This work provides a new way to obtain high-performance self-powered photodetectors.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS TECHNOLOGY
·
2014
·
IF 0.746
D. Zhang,B. Zhang,X. N. Tang,Y. P. He,G. C. Gao,P. Jiang
A new inorganic antibacterial material was synthesised by the sol–gel method using copper ion as antibacterial ion, holmium nitrate as additive and white carbon black as carrier. The structure and properties of the inorganic antibacterial material were characterised by inductively coupled plasma atomic emission spectroscopy, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM) techniques, energy dispersive spectrum (EDS) analysis, X-ray diffraction (XRD) and antibacterial experiments (Escherichia coli as experimental bacteria). The result showed that the bacteriostasis rate of this new material was higher than that of the general Cu antibacterial white carbon black (without containing holmium); the bacteriostasis rate was over 90%. The form of the inorganic antibacterial material was investigated by XRD. The difference between the new inorganic antibacterial material and white carbon black was studied by FT-IR. Scanning electron microscopy and EDS were used to detect the holmium ion in the material.
研究领域:
材料科学
·
微生物学
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2016
·
IF 2.101
Yichao Lv,Songping Wu,Rui Xu
The HoMn 2 O 5 nanorods were synthesized by a surfactant-assisted hydrothermal process. The length of nanorods is readily controllable with basically constant diameter. HoMn 2 O 5 nanorods show recognizable divagation at T N (Ho) of 13 K between FC and ZFC curve due to the contribution of the magnetic ordering of holmium . Size-dependent magnetic properties (i.e. a critical length for magnetization) of HoMn 2 O 5 nanorods can be ascribed to the competition between surface strain and uncompensated spin at the surface.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
LASER PHYSICS LETTERS
·
2019
·Vol. 16
·期 11
·115101
·
IF 2.328
Z P Zhao,C F Yao,Z R Li,Z X Jia,G S Qin,Y Ohishi,W P Qin
We reported a multi-watt ~2.1 µm laser output from a 30 cm long Ho3+-doped fluorotellurite microstructured fiber (FTMF) pumped by a homemade 1980 nm Tm3+-doped silica fiber laser. When the pump power was increased to 61.8 mW, lasing at 2067 nm was achieved from the Ho3+-doped FTMT, and an unsaturated maximum output power of ~8.08 W was obtained for a pump power of ~10.56 W. The corresponding slope efficiency was about 77.21%. During our experiments, no obvious damage was observed on the end face of the Ho3+-doped FTMF. Our results indicated that Ho3+-doped fluorotellurite fibers had the potential for constructing high power fiber lasers at 2.1 µm.
研究领域:
光学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）