PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2013
·Vol. 15
·期 35
·14681-14688
·
IF 3.829
Xingyuan Guo,Weiye Song,Changfeng Chen,Weihua Di,Weiping Qin
A novel near-infrared (NIR)-responsive photocatalyst, β-NaYF4:Yb3+,Tm3+@ZnO composites, was prepared by a two-step high temperature thermolysis method. In the NIR-responsive photocatalysis, β-NaYF4:Yb,Tm served as a NIR-to-UV upconverter and provided “UV light” or “necessary energy” to the ZnO catalyst. The energy transfer in the composites and the mixtures of β-NaYF4:Yb,Tm and ZnO was studied by using steady-state and dynamic fluorescence spectroscopy. The NIR photocatalytic activities were investigated by the decomposition of Rhodamine B. It was found that the energy transfer processes dominated the overall photocatalytic activities, and the generation of hydroxyl radicals was the origin of organic pollutant decomposition under NIR irradiation.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2014
·Vol. 14
·期 5
·3726-3730
·
IF 1.339
Guo Xingyuan,Song Weiye,Wang Jianshuo,Shi Feng,Qin Weiping
β-NaYF4:Yb3+, Tm3+/ZnO core/shell nanoparticles (NPs) were synthesized via a high temperature thermal decomposition method. The as-synthesized core/shell NPs were characterized by X-ray diffraction (XRD), transmission electron microscopy
(TEM), and upconversion luminescence spectra (UCL). Under 980 nm laser excitation, the measured intensity of upconversion luminescence (1I6→3H6, 1I6→3F4, and 1D2→3H6)
was different with and without ZnO. During the sample preparations, changing the ratio of the solvent affected the ZnO UV absorption efficiency. The results show that the NIR light can be used as the driving source to excite ZnO, thus extending utility rate to the NIR spectral region and enhancing
the light harvest rate.
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Journal of Materials Chemistry C
·
2012
·Vol. 1
·期 6
·1168-1173
·
IF 0
Jie Chang,Ye Liu,Jie Li,Suli Wu,Wenbin Niu,Shufen Zhang
Due to the strong tissue absorption of short-wave-length light below 600 nm, in vivo imaging based on UCNPs as luminescent probes is still limited. The NIR spectral range (700–1100 nm) and the red region (600–700 nm) are referred to as the “optical window” of the biological tissues because the light scattering, absorbance and autofluorescence of tissue are minimum in this range. Here we synthesized NaYF4:Yb3+,Tm3+/CdS nanoheterostructures. In the nanoheterostructures, the red (700 nm) and NIR (802 nm) emissions of NaYF4:Yb,Tm were enhanced by 7.3 times, while the blue emission peak at 476 nm nearly disappeared and no peak of CdS appeared. Transmission electron microscopy (TEM) images show that the morphology of the binary nanoparticles is predominantly peanut-like and the X-ray diffraction (XRD) patterns of the NaYF4:Yb3+,Tm3+/CdS nanoheterostructure were assignable to both wurtzite phase CdS and hexagonal phase NaYF4:Yb3+,Tm3+. In comparison, introducing Cd2+ ions or S2− ions or preparation of physical mixture of NaYF4:Yb3+,Tm3+ and CdS did not enhance the red (700 nm) and NIR (802 nm) emissions of NaYF4:Yb, Tm. These results indicated that the interactions in the NaYF4:Yb3+,Tm3+/CdS nanoheterostructure played a key role for enhancing the NIR emission of NaYF4:Yb3+,Tm3+ nanocrystals. QDs act as a sub energy level to mediate energy transfer of Tm3+. To evaluate the effect of other QDs on the upconverted fluorescence spectrum of NaYF4:Yb3+,Tm3+, NaYF4:Yb3+,Tm3+/CdSe nanoheterostructures were also prepared by a similar method. The upconverted fluorescence spectra indicated that by conjugation with CdSe, the NIR emission at 802 nm of NaYF4:Yb3+,Tm3+ was also enhanced greatly.
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MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Zhangxu Chen,Ming-Lai Fu
To extend the activities of TiO 2 to the near infrared (NIR) region and to separate and recycle photocatalysts easily is vital for the high harvest of solar energy for sustainable society. The magnetic NIR activated Fe 3 O 4 @SiO 2 /β-NaYF 4 :Yb 3+ ,Tm 3+ /TiO 2 (FS/UC/T) composites have been synthesized by using the solvothermal method by adding Fe 3 O 4 @SiO 2 and Degussa P25 into the mixed solution of NaOH, ethanol, oleic acid, Re(NO 3 ) 3 and NH 4 F. Moreover, the obtained composites were explored for photocatalytic applications. It was found that FS/UC/T emit UV–vis light under irradiation of 980 nm laser and efficient energy transfer from β-NaYF 4 :Yb 3+ ,Tm 3+ to TiO 2 was verified. The photodegradation experiments for treating methylene blue (MB), rhodamine B (RhB), methyl orange (MO) and colorless phenol were carried out to evaluate the photocatalytic activities of the samples. The photodegradation rates reach 76.62%, 68.48%, 30.05% and 27.16% for MB, RhB, MO and phenol under irradiation of 980 nm laser, respectively, which suggested magnetic FS/UC/T composite is an advanced NIR-driven photocatalyst. Moreover, the magnetic photocatalyst showed easy separation and good stability in the recycled tests. It suggested a promising system to utilize the NIR energy for photocatalysis based on TiO 2 and to utilize the magnetic for separation of photocatalysts, which will contribute to practical environmental remediation in the future.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Huining Huang,Huiliang Li,Zeyan Wang,Peng Wang,Zhaoke Zheng,Yuanyuan Liu,Ying Dai,Yingjie Li,Baibiao Huang
In this work, we fabricated NaYF 4 :Yb 3+ ,Tm 3+ @NaYF 4 :Yb 3+ ,Nd 3+ @TiO 2 (Tm@Nd@TiO 2 ) core@shell nanoparticles and investigated their near-infrared (NIR) photocatalytic activities. Comparing to traditional TiO 2 based upconversion (UC) photocatalysts (i.e., NaYF 4 :Yb 3+ ,Tm 3+ @TiO 2 , named Tm@TiO 2 ), Tm@Nd@TiO 2 exhibits enhanced photocatalytic activity under NIR light irradiation. The photocatalytic activity of Tm@Nd@TiO 2 under 980, 808, and 980 + 808 nm laser irradiation is 4.40, 5.84, and 9.83 times as high as that of Tm@TiO 2 under only 980 nm irradiation, respectively. The ethylene degradation rate of Tm@Nd@TiO 2 under 980 + 808 nm laser irradiation is 6.4 times as that of Tm@TiO 2 . The photocatalytic activity of Tm@Nd@TiO 2 under visible + NIR irradiation is even comparable with (∼2/3) that under UV light irradiation during Rhodamine B (RhB) degradation. The enhanced photocatalytic activity of Tm@Nd@TiO 2 can be attributed to the stronger light absorption in NIR region ascribed to Nd 3+ , lower water absorption and the enhanced UC emission of Tm@Nd with unique core@shell nanostructures. This work can provide a possible route to improve the NIR photocatalytic activity and stimulate the applications in many other fields.
研究领域:
材料科学
·
光催化技术
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MATERIALS & DESIGN
·
2023
·
IF 8.4
Shuai Zha,Siyu Pan,Yuehan Jian,Yunhui Peng,Lijun Jiang
Hydrogen sulfide (H 2 S), a third gas signaling molecule, is considered to play a vital role in the development and treatment of diseases. To elucidate the intricate role of H 2 S in the organism and its participation in disease processes, there is an urgent need to visualize the dynamics of H 2 S. However, most currently available molecular probes have limitations in terms of sensitivity, specificity, and precision. In this study, the safe and biocompatible upconversion nanosensor NaYF 4 :Yb 3+ , Tm 3+ @NaYF 4 anchored with Ag 2 O was successfully fabricated for H 2 S detection with an ultralow detection limit at 0.93 ng/mL. NaYF 4 :Yb 3+ , Tm 3+ @NaYF 4 @Ag 2 S is formed through in situ sulfuration reaction, and second near-infrared (NIR-II) fluorescence can be recorded upon the presence of H 2 S under 808 nm excitation. The results demonstrate the exceptional detection linearity and high specificity for H 2 S quantification. Additionally, NaYF 4 :Yb 3+ , Tm 3+ @NaYF 4 @Ag 2 O possesses a safe nature in normal and cancer cells. This nanosensor presents a NIR fluorescence imaging strategy for highly sensitive and specific detection of H 2 S, which has promises to be a practical tool for biomedical applications.
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Materials Research Express
·
2023
·Vol. 10
·期 8
·086201
·
IF 2.3
Bing Liu,Jingheng Liang,Lili Wang,Zian Cheak Tiu
β-NaYF4: Yb3+/Tm3+/Zr4+ microcrystals are synthesized by a facile hydrothermal route. The up-conversion (UC) luminescence and photoelectric effects are enhanced simultaneously with the introduction of Zr4+ ions under IR excitation. With the Tm3+ ions fluorescence spectra under 980 nm excitation, the blue and red emissions reached the highest intensity in the case of 4 mol% Zr4+ doping. Taking the advantage of Zr4+ stimulates the free electrons transfer from the valence band (VB) to the conduction band (CB) in β-NaYF4:Yb3+/Tm3+/Zr4+ microcrystals, the photocurrent reached the highest intensity in the case of 4 mol% Zr4+ doping at 780 nm excitation. The β-NaYF4: Yb3+/Tm3+/Zr4+ microcrystals with both enhanced UC luminescence and photoelectric properties are highly potential to contribute in photovoltaic and infrared sensors application.
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Catalysis Science & Technology
·
2025
·
IF 4.2
Yuangong Ma,Youlin Huang,Wensheng Zhang,Zhishan Liang,Bo Ding,Dongfang Han,Dongxue Han,Li Niu
In the domain of photocatalysis, harnessing solar energy, particularly the near-infrared (NIR) spectrum, presents formidable challenges. To overcome these, a novel NIR-responsive photocatalyst, denoted as NYT@ZnO@RGO@Ag, was meticulously crafted. This photocatalyst comprises a NaYF4: Yb3+, Tm3+@ZnO structure supported on reduced graphene oxide (RGO) and further composited with silver nanoparticles. It was rigorously evaluated for its performance in photodegrading tetracycline (TC) antibiotics as a model compound. Leveraging the unique properties of upconversion materials, wide bandgap semiconductors, and localized surface plasmon resonance (LSPR), the NYT@ZnO@RGO@Ag catalyst exhibited an impressive photodegradation rate of 93.6% for TC under NIR light exposure. This efficiency surpassed that of NYT@ZnO (38.2%) and NYT@ZnO@RGO (72.3%). The remarkable enhancement in NIR-driven photocatalysis observed in NYT@ZnO@RGO@Ag is primarily attributed to the efficient process of fluorescence resonance energy transfer (FRET) from NYT to its each component. This process enhances photo-induced carrier generation and facilitates efficient transfer and energy utilization under NIR irradiation. The present study offers a promising approach for NIR-driven photocatalytic degradation of pollutants in environments with limited light exposure or even under dark conditions.
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TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2020
·
IF 2.615
Yin CHEN,Shao-wen XIE,Chao TONG,Hai-hu TAN,Li-jian XU,Na LI,Jian-xiong XU
Novel hydrophilic NaYF 4 :Yb 3+ ,Tm 3+ @NaGdF 4 :Ce 3+ ,Eu 3+ double-jacket microtubes (DJMTs) with upconversion/ downconversion dual-mode luminescence were designed and prepared through epitaxial growth of NaGdF 4 :Ce 3+ , Eu 3+ shell onto the NaYF 4 :Yb 3+ ,Tm 3+ microtube via poly(acrylic acid) (PAA) mediated hydrothermal method. It is demonstrated that PAA ligand played an important role in guiding the direct growth of NaGdF 4 :Ce 3+ ,Eu 3+ shell onto the surface of NaYF 4 :Yb 3+ ,Tm 3+ parent microtubes. The growth of NaGdF 4 :Ce 3+ ,Eu 3+ shell experienced a crystal phase transition from β -NaGdF 4 and β -NaYF 4 mixture to β -NaYF 4 @NaGdF 4 composite crystal, and morphology evolution from mixture of β -NaGdF 4 :Ce 3+ ,Eu 3+ nanorods and β -NaYF 4 :Yb 3+ ,Tm 3+ microtubes to NaYF 4 :Yb 3+ ,Tm 3+ @NaGdF 4 : Ce 3+ ,Eu 3+ DJMTs. The formation mechanism of DJMTs was the dissolution−renucleation of β -NaGdF 4 :Ce 3+ ,Eu 3+ nanorods and the growth of β -NaGdF 4 :Ce 3+ ,Eu 3+ shell via the classical Ostwald ripening mechanism. The as-prepared DJMTs could exhibit blue upconversion and red downconversion luminescence, which was further made into environmentally benign luminescent inks for creating highly secured and fluorescent-based anti-counterfeiting patterns via inkjet printing.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Mingzhou Meng,Tianmei Zhang,Jiaoyu Wang,Zhenlong Cheng,Yuanli Liu,Xin Qiao,Jian Wen,Ute Resch-Genger,Wen Long,Jun Ou
The core–shell NaYF4:Yb3+/Tm3+@NaYF4:Yb3+ upconversion nanoparticles were successfully prepared by a solvothermal method, and a layer of mesoporous silica (mSiO2) was successfully coated on the periphery of the core–shell nanoparticles to transform their surface from lipophilic to hydrophilic, further expanding their applications in biological tissues. The physical phase, morphology, structure, and fluorescence properties were characterized by X-ray diffraction (XRD), field emission transmission electron microscopy (TEM), Fourier infrared spectroscopy (FT-IR), ζ potential analysis, and fluorescence spectroscopy. It was found that the material has a hexagonal structure with good hydrophilicity and emits intense fluorescence under 980 nm pump laser excitation. The non-contact temperature sensing performance of nanoparticles was evaluated by analyzing the upconversion fluorescence of Tm3+ (1G4 → 3F4 and 3F3 → 3H6) in the temperature range of 284–344 K. The absolute and relative sensitivities were found to be 0.0067 K–1 and 1.08 % K–1, respectively, with high-temperature measurement reliability and good temperature cycling performance. More importantly, its temperature measurement in phosphate-buffered saline (PBS) solution is accurate. In addition, the temperature of the cells can be increased by adjusting the laser power density and laser irradiation time. Therefore, an optical temperature sensing platform was built to realize the application of real-time monitoring of cancer cell temperature and the dual function of photothermal therapy.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2014
·
IF 2.291
Xingyuan Guo,Changfeng Chen,Shengyan Yin,Weiye Song,Feng Shi,Weiping Qin.
In this work, the effects of NaYF 4 :Yb 3+ , Tm 3+ (NYT) structure on the near-infrared light (NIR) photocatalysis performance of ZnO were investigated. α-NYT/ZnO nanocomposites (NCs) and β-NYT/ZnO NCs were fabricated by a high temperature decomposition reaction method. The prepared NCs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV–vis spectroscopy, Raman spectroscopy, and photoluminescence spectra (PL). The NIR photocatalytic activities of the synthesized α- and β-NYT/ZnO NCs were studied by the degradation of Rhodamine B. The differential photocatalytic activities between of α- and β-NYT/ZnO NCs are believed to be correlated to the effects of α- and β-NYT on the oxygen vacancies and exposed crystal face of ZnO.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jinyuan Zhang,Tong Liu,Tian Shi,Zhiyuan Cheng,Fuhua Gao,Da Cai,Shenghong Yang,Yueli zhang
Constructing comprehensive performance-enhanced heterostructured composite using the synergistic effect of complementary advantages between heterogeneous materials has always been challenging. In this work, highly stable β-NaYF 4 :Yb 3+ , Tm 3+ @BiOCl (NYF@BiOCl) heterostructured upconversion composites were successfully prepared using a two-step hydrothermal method. Compared to NYF/BiOCl mechanical mixtures, NYF@BiOCl with intimate interface show a higher photocatalytic degradation rate of rhodamine B (RhB) aqueous solutions, achieving 99.9% in 18 min and 98% in 2 h under simulated sunlight and near-infrared (NIR) light, respectively. The construction of heterostructures has a broad-spectrum response, which improves the utilization of sunlight and achieves efficient photocatalytic degradation of organic contaminants. Upconversion luminescence mechanism, spectral overlap, and Förster resonance energy transfer (FRET) explain the high photocatalytic activity of NYF@BiOCl. Meanwhile, NYF@BiOCl exhibits good universality to efficiently degrade other organic contaminants (methyl orange (MO), methylene blue (MB), bisphenol A (BPA), p-chlorophenol (4-CP)). This study demonstrates the potential of synergistic effects between heterogeneous materials. It Enhanced the photocatalytic activity of the NYF@BiOCl heterostructured composites driven by NIR light, providing a new strategy for energy-efficient and degradation of hazardous organic contaminants to alleviate environmental pollution.
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