Journal of Physical Chemistry C
·
2018
·
IF 4.484
Peng Zhao,Yanlu Li,Lili Li,Shulin Bu,Weiliu Fan
Here, we report oxygen vacancy (VO)-modified B/N-codoped ZnGa2O4 (VO-B/N-ZGO) nanospheres, showing excellent photocatalytic H2 production even without a Pt cocatalyst, which is better than that obtained with VO-modified B-doped ZnGa2O4 (VO-B-ZGO) or N-doped ZnGa2O4 (N-ZGO) and as high as about three times of that achieved with the undoped ZnGa2O4 (ZGO) photocatalyst. The dramatically enhanced photocatalytic activity of VO-B/N-ZGO predominately originates from the improvement of charge separation and surface activation. Experimental characterization combined with the theoretical calculation method demonstrates that VO-B/N-ZGO can show effective charge compensation more easily through the interaction of oxygen vacancies, interstitial boron, and substitutional nitrogen; especially for the formation of a B–N bond, it avoids the presence of semioccupied states as new recombination centers in a doped photocatalyst. In addition, VO-B/N-ZGO rich in reactive sites is generated by oxygen vacancy-modified B/N-codoping, which overcomes the limitation for most semiconductors without high H2 evolution activities in the absence of a cocatalyst and provides a potentially new photocatalytic H2 generation research.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 14
·6377-6385
·
IF 3.5
Chengping Fang,Shuoheng Wang,Shuai Wei,Qingxian Xu,Zeyu Lyu,Sida Shen,Taixing Tan,Hongpeng You
NIR luminescent materials have garnered widespread attention because of their exceptional properties, with high tissue penetration, low absorption and high signal-to-noise ratio in the field of optical imaging. However, producing nanophosphors with high quantum yields of emitting infrared light with wavelengths above 1000 nm remains a significant challenge. Here, we prepared a nanoscale ZnGa2O4:xCr3+,yNi2+ phosphor with good luminescence performance in near-infrared emission, which was synthesized via a hydrothermal method and subsequent calcination process. By co-doping with Cr3+ and Ni2+, the ZnGa2O4 phosphor shows a strong broadband emission of 1100–1600 nm in the second near-infrared (NIR-II) region, owing to the energy transfer from Cr3+ to Ni2+ with an efficiency up to 90%. Meanwhile, a near-infrared phosphor-conversion LED (NIR pc-LED) device is fabricated based on the ZnGa2O4:0.8%Cr3+,0.4%Ni2+ nanophosphor, which has under 100 mA input current, an output power of 23.99 mW, and a photoelectric conversion efficiency of 7.53%, and can be effectively applied in imaging and non-destructive testing. Additionally, the intensity ratio of INi/ICr of ZnGa2O4:0.8% Cr3+,0.4%Ni2+ with its high sensitivity value of 4.21% K−1 at 453 K under 410 nm excitation, indicates its potential for thermometry application.
研究领域:
材料科学
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光学工程
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生物医学工程
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DOI
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Jing-Yun Yang,Ye Zhang,Xia Ji,He-Fang Wang
Surface-enhanced Raman scattering (SERS) has been widely investigated in recent years. The subtle design and synthesis of SERS substrates, including the semiconductor–metal composites, are the key but difficult points. To date, only the short-lived semiconductors are involved, and no research has been conducted concerning the long-lived ones although the persistent luminescence semiconductors have great potential of charge transfer in relatively long durations. Herein, we present a concept of afterglow-assistant SERS (AASERS) on the long-lived gold shell-capped Cr3+-doped ZnGa2O4 (CZGO@Au) substrate. The normal SERS, AASERS acquired immediately after 2 min illuminating of a 633 nm laser, AA-1 min SERS acquired 1 min after 2 min illuminating of a 633 nm of the typical analytes on CZGO@Au, ZnGa2O4@Au (ZGO@Au), and gold nanostars (GNSs) with the same UV–vis absorption wavelength are systematically compared. The CZGO@Au owns the SERS signals that are 1.8 times of ZGO@Au and 3.4 times of GNSs. A higher AASERS than the corresponding SERS (1.65 times) is only observed on CZGO@Au, and the AASERS on CZGO@Au is 2.8 times of that on ZGO@Au and 5.2 times of that on GNSs. Because of the afterglow decay of CZGO@Au, the AA-1 min SERS on CZGO@Au returns to its SERS. These data demonstrate that the AASERS on long-lived substrates is a promising way for further enhancing SERS signals just by laser illuminating the substrates, and thus affords alternatives for reducing the difficulties in the complicated synthesis of the exquisite substrates. The AASERS mechanism and the application of CZGO@Au in SERS imaging of living U87MG cells are also discussed.
研究领域:
材料科学
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分析化学
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纳米技术
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Advances
·
2025
·
IF 4.7
Zeyu Yang,Jizhou Yang,Haibo Fan
The photocatalytic degradation of Rhodamine B (RhB) from a one-step hydrothermal prepared ZnGa2O4/Ga2O3 with a double shell hollow sphere structure has been investigated. It is found that this structure can greatly improve the photocatalytic performance through the formation of S-scheme heterojunction in the interface between ZnGa2O4 and Ga2O3. By optimizing the feed ratio, the maximum degradation rate of RhB is 0.1133 min−1, which is nearly 2 times higher than Ga2O3 monomer photocatalyst, 5 times higher than ZnGa2O4 monomer catalytic performance, and 96 times higher than RhB self-degradation rate. Capture experiments show that h+ plays a key role in the efficient decomposition of RhB reactive groups. This study provides a new idea and a simple preparation method of novel ZnGa2O4/Ga2O3 S-scheme heterojunction for efficient photocatalytic degradation of organic pollutants.
研究领域:
材料科学
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环境科学
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光催化技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Wenhui Chen,Tianxin Kang,Fenqi Du,Peipei Han,Meiling Gao,Peng Hu,Feng Teng,Haibo Fan
One-dimensional shaped ZnGa 2 O 4 , ZnO and ZnGa 2 O 4 /ZnO nanofibers were successfully prepared by electrostatic spinning technique and the photocatalytic degradation performance of tetracycline hydrochloride (TC-HCl) were studied. It was found that the S-scheme heterojunction formed in the ZnGa 2 O 4 /ZnO could greatly reduce the recombination of the photogenerated carriers and therefore improve the photocatalytic performance. By optimizing the ratio of the ZnGa 2 O 4 and ZnO, the largest degradation rate could reach 0.0573 min −1 , which was 20 times of the self-degradation rate of TC-HCl. It was verified that the h + played the key role in the reactive groups for the high performance decomposition of TC-HCl by capture experiments. This work provides a new method for the highly efficient photocatalytic degradation of TC-HCl.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2017
·
IF 4.164
Hongbin Chen,Bin Zheng,Chao Liang,Li Zhao,Ying Zhang,Huizhuo Pan,Wanying Ji,Xiaoqun Gong,Hanjie Wang,Jin Chang
The photothermal therapy agents induced by 808 nm near infrared light laser have good potential for photothermal therapy (PTT) in vivo, with the advantages of harmless treatment, minimally invasion, high efficiency and deep tissue penetration. For the traditional photothermal therapy agents, however, it was impossible to track them in vivo because of the low signal-to-noise ratio, so we cannot conduct the extra near infrared light laser to radiate tumors sites accurately. Herein, we introduce a new complex: indocyanine green (ICG), near-infrared persistent luminescence (PL) phosphors ZnGa 2 O 4 :Cr 3 + (ZGC) and mesoporous silica nanoparticles (MSNs) (ICG@mZGC nanoparticles) were assembled for long-lasting optical imaging to guide PTT. The results revealed that the novel nanoparticle, ICG@mZGC, could lower signal-to-noise ratio, enable highly sensitive optical detection during optical imaging-guided PTT and perform a good effect of photothermal therapy in vivo, and thus providing possibilities for mZGC to improve the localization precision of tumor sites in photothermal therapy in the body.
研究领域:
生物医学工程
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纳米医学
·
光学成像
✓ 已验证
DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 7
·782
·
IF 2.881
Liu Wang,Wenrui Zhang,Ningtao Liu,Tan Zhang,Zilong Wang,Simiao Wu,Zhaolin Zhan,Jichun Ye
ZnGa2O4is a promising semiconductor for developing high-performance deep-ultraviolet photodetectors owing to a number of advantageous fundamental characteristics. However, Zn volatilization during the ZnGa2O4growth is a widely recognized problem that seriously degrades the film quality and the device performance. In this study, we report the synthesis of epitaxial ZnGa2O4thin films by pulsed laser deposition using a non-stoichiometric Zn1+xGa2O4target. It is found that supplementing excessive Zn concentration from the target is highly effective to stabilize stochiometric ZnGa2O4thin films during the PLD growth. The influence of various growth parameters on the phase formation, crystallinity and surface morphology is systematically investigated. The film growth behavior further impacts the resulting optical absorption and thermal conductivity. The optimized epitaxial ZnGa2O4film exhibits a full width at half maximum value of 0.6 degree for a 120 nm thickness, a surface roughness of 0.223 nm, a band gap of 4.79 eV and a room-temperature thermal conductivity of 40.137 W/(m⋅K). This study provides insights into synthesizing epitaxial ZnGa2O4films for high performance optoelectronic devices.
研究领域:
材料科学
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半导体物理
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薄膜制备
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光电子学
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凝聚态物理
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2015
·
IF 2.711
Mingjia Lu,Xin Ouyan,Songping Wu,Rongyun Ge,Rui Xu
Self-assembled porous ZnGa 2 O 4 particles were synthesized through a facile hydrothermal route in this work. The phase evolution and microstructure of specimens were identified by XRD and SEM. Various morphologies (i.e. porous, nanorods or spherical particles) and size (nano or micro-sized) could be rationally designed through altering the reaction conditions. Hydrothermal ZnGa 2 O 4 particles exhibited an outstanding microwave dielectric performance, i.e. a dielectric constant of 9.93, a Q × f value of 73 000 GHz, and a τ f value of –68.7 ppm/ °C. What is more, the ZnGa 2 O 4 ceramics displayed a stable quality factor in the high temperature region (1400–1500 °C) due to the unique frame-structured ZnGa 2 O 4 particles. Therefore, they can be regarded as potential candidate materials for millimeter-wave device.
研究领域:
材料科学
·
微波工程
·
化学合成
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Jun Liang,Yao Chai,Li Li,Deli Li,Jinni Shen,Yongfan Zhang,Xuxu Wang
The conversion of CO 2 into renewable fuels by artificial photosynthesis is an attractive solution for storing solar energy in the form of chemical fuel. Herein, we presented a general molten-salt route to synthesize spinel germanium and iron double-substituted ZnGa 2 O 4 solid solutions. Introducing ZnFe 2 O 4 and Zn 2 GeO 4 into ZnGa 2 O 4 can effectively expand the light-harvesting wavelength range to improve the ability of photocatalyst in CO 2 reduction and H 2 O oxidation. The solid solutions provide a larger effective mass of holes compared with electrons through the introduction of Fe3d, Ge4s and Ge4p orbitals according to DFT analysis. This leads to a great difference in the mobility between the electrons and holes to lessen the electron–hole recombination rate, and enhance the conversion of CO 2 and H 2 O in kinetics. This approach is developed to achieving smaller bandgap values and a closer bracketing of the CO 2 /reduced-H 2 O/oxidized redox couples to drive the overall conversion of CO 2 and H 2 O.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 10
·1508-1518
·
IF 4.776
Hanghang Liu,Feng Ren,Hao Zhang,Yaobao Han,Huizhu Qin,Jianfeng Zeng,Yong Wang,Qiao Sun,Zhen Li,Mingyuan Gao
Near-infrared (NIR) long lasting persistent luminescence nanoparticles (PLNPs) have attracted considerable attention in the area of in vivo bioimaging, due to their background-free luminescence characteristics and deep tissue penetration. However, the low fluorescence quantum yield and short afterglow of the currently available PLNPs limit their applications. Here, water-soluble Cr3+-doped ZnGa2O4 PLNPs with the highest quantum yield (η = 20%) ever reported, bright NIR emission, and excellent colloidal stability were successfully prepared by a one-step hydrothermal method. The afterglow of the resultant nanocrystals lasted for more than 5 days and could be repeatedly reactivated by the light (λ = 657 nm) of a portable light emitting diode lamp after decay. These nanocrystals were functionalized with α,ω-dicarboxyl-terminated poly(ethylene glycol) and poly(acrylic acid) to improve their stability and biocompatibility, so that they could be conjugated with a c(RGDyK) peptide and labeled with 99mTc for targeted imaging of orthotopic breast cancer by afterglow luminescence imaging and single-photon emission computed tomography imaging. Our NIR-PLNP probes can effectively avoid tissue auto-fluorescence and the light scattering caused by continuous excitation during the diagnosis of cancer.
研究领域:
生物医学工程
·
材料科学
·
肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2016
·
IF 4.732
Xian Hou,Tongtong Xuan,Hengchao Sun,Xiaohong Chen,Huili Li,Likun Pan
ZnGa 2 O 4 :Eu 3+ nanophosphor was synthesized through a hydrothermal method and used as an effective light down-shifting/converting material in mesoporous TiO 2 layer of perovskite solar cells (PSCs). The nanophosphor can convert the high energy incident photon into the photon(s) with lower energy, which can excite CH 3 NH 3 PbI 3 to generate more photo generated electron–hole pairs, and thus promote the incident light use ratio and increase the power conversion efficiency (PCE) of PSCs. After the incorporation of suitable amount of ZnGa 2 O 4 :Eu 3+ into PSCs, the cell PCE is increased to 13.80% with a photocurrent density of 23.68 mA cm − 2 and a highest PCE of 14.34% with a photocurrent density of 25.02 mA cm −2 is achieved, much higher than those of the cell without ZnGa 2 O 4 :Eu 3+ (PCE of 10.67% and photocurrent density of 20.2 mA cm −2 ). The enhanced photovoltaic performance by incorporating the nanophosphor into PSCs should be ascribed to the increased incident light use ratio and improved exciton generation rate.
研究领域:
材料科学
·
纳米技术
·
太阳能
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yi-Fan Gao,Rui Zou,Guang-Feng Chen,Bo-Mei Liu,Yong Zhang,Ju Jiao,Ka-Leung Wong,Jing Wang
Featured with excellent biocompatibility and background-free biomedical imaging, near infrared persistent luminescence (NIR-PersL) nanomaterials synthesized by mesoporous silica nanoparticles (MSNs) template have captured increasing attentions to be as a tumor theranostic nanoplatform. Unfortunately, many researches in the past decades have mainly focused on bioimaging performance of NIR-PersL nanomaterials themselves but not synergistically on tailoring the pore volume of the MSNs to optimize the drug loading/releasing performance, which greatly limits their potential application in tumor theranostics. In this work, we propose a tailorable large-pore mesoporous-silica-assisted synthesis strategy to synthesize a series of ZnGa 2 O 4 :Cr 3+ /Sn 4+ @MSNs (ZGOCS@MSNs) NIR-PersL nanospheres as nanoplatform. The ZGOCS@MSNs possess average diameters of ~ 80 nm. More interestingly, the mass ratio of ZGOCS to MSNs (MRZM) increases with the increasing of pore sizes of MSNs and the NIR-PersL performances of ZGOCS@MSNs enhance with the increase of MRZM, suggesting that MRZM plays an important role in optimizing NIR-PersL performance of the nanospheres. In vitro and in vivo NIR-PersL imaging further confirm the MRZM-dependent performance enhancement in NIR-PersL nanospheres. More importantly, the employment of large pore MSNs maintains the mesoporous structure of NIR-PersL nanospheres and the residual pore volume of ZnGa 2 O 4 :Cr 3+ /Sn 4+ @MSNs is high enough and available for efficient drug loading/releasing. Benefited from excellent rechargeable tumor NIR-PersL imaging ability and large residual cavities, ZGOCS@MSNs show high dose (~53%) of loading DOX and exhibit outstanding cancer cell killing efficiency, implying the MRZM also plays an important role in optimizing the drug loading/releasing performance of the nanospheres. In summary, the as-synthesized high performance ZnGa 2 O 4 :Cr 3+ /Sn 4+ @MSNs bi-functional nanoplatform showcases its great potential for imaging-guided cancer chemotherapy. We expect our work could take the development of NIR-PersL-based theranostic nanoplatforms a step forward.
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
危险品化学品经营许可证（带存储）