NANOTECHNOLOGY
·
2020
·Vol. 31
·期 14
·145504
·
IF 3.551
Zixiao Zhao,Jiawei Shen,Min Wang
Numerous investigations have been devoted to visualizing latent fingerprints (LFPs) for personal identification in forensic investigation and age estimation. While simultaneous detection of chemicals in fingerprint residues has yet to be explored. Herein, fluorescent NaYF4:Yb/Tm up-conversion nanoparticles (UCNPs), which can emit blue fluorescence upon 980 nm near-infrared irradiation, have been employed in the imaging of LFPs with high contrast and high sensitivity. The furrows and ridges which provide detailed information of LFP have been displayed clearly by Tm-doped UCNPs. Meanwhile, the quantitation of nicotine residue in LFPs has been achieved based on the blue fluorescence absorbed by I2-nicotine complex, and the data was analyzed by MATLAB with modified OPTA algorithm. It was proved that the established strategy was specific, sensitive, reliable and practical toward nicotine residue in LFPs with a detection limit of 0.05 μg.
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CRYSTENGCOMM
·
2018
·Vol. 20
·期 14
·1945-1953
·
IF 3.304
Kaimin Du,Xia Xu,Shuang Yao,Pengpeng Lei,Lile Dong,Manli Zhang,Jing Feng,Hongjie Zhang
Hexagonal phase (β-) NaYF4:Yb/Er upconversion (UC) microrods doped with Cu2+ ions were prepared via a facile solvothermal method. Simultaneous phase and shape control of NaYF4:Yb/Er crystals with enhanced upconversion luminescence (UCL) was successfully realized by codoping with Cu2+ ions. With an increasing Cu2+ ion concentration in the NaYF4:Yb/Er system, the crystal structure changed from a mixture of α- and β-phases to the pure β-phase and was converted into highly uniform microrods. As for the Cu2+ ion doped β-NaYF4:Yb/Er upconversion microrods, the maximum emission occurs with the sample added with 60 mol% Cu2+ ions and the UCL intensities of the green and red emissions were enhanced 37 and 25 times, respectively. Meanwhile, the possible mechanisms for the enhanced UCL of NaYF4:Yb/Er crystals were also discussed in detail. Moreover, the temperature dependent UCL properties of 60 mol% Cu2+ ion doped β-NaYF4:Yb/Er were studied under 980 nm excitation, which were temperature-sensitive over a wide temperature range from 123 K to 423 K. The change in UCL intensity influenced by temperature was discussed in detail.
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Inorganic Chemistry Frontiers
·
2016
·Vol. 3
·期 8
·1082-1090
·
IF 4.532
Min Li,Xiaoyang Liu,Li Liu,Bing Ma,Benxian Li,Xudong Zhao,Wenming Tong,Xiaofeng Wang
A series of Yb3+/Tm3+ co-doped β-NaYF4 (β-NaYF4:Yb,Tm) crystals have been successfully synthesized via the molten salt synthesis (MSS) method. A unique strong green emission of Tm3+ was observed, which cannot be obtained by any other method. The red, green and blue (RGB) light emissions have been obtained simultaneously in the presence of a single activator (Tm3+). The influencing factors of crystal growth have been studied in detail, in order to understand the change of the transition probabilities of Tm3+. Subsequent studies indicate that the RGB light emissions of Tm3+ can be effectively tuned by varying the concentration of sensitizers (Yb3+ and Mn2+) and the reaction time. Consequently, the effective multicolor upconversion (UC) luminescence was obtained, especially a strong white light, which was not obtained in the β-NaYF4:Yb,Tm system earlier. To our knowledge, it is the first time that the UC properties in the β-NaYF4:Yb,Tm system have been investigated by altering the transition probabilities at the same energy level of Tm3+.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Nguyen Thi Ngoc Yen,Vuong Thanh Tuyen,Cao Thi My Dung,Le Thuy Thanh Giang,Tran T.T. Van
The degradation of persistent organic dyes, such as methylene blue (MB), is crucial for protecting aquatic environments, as these compounds are chemically stable and resistant to conventional treatment methods. The TiO 2 -based photocatalysts have been widely explored for pollutant degradation owing to their chemical robustness, eco-friendliness, and strong oxidative capability under light irradiation. However, its wide bandgap (∼3.0–3.2 eV) restricts optical absorption to the ultraviolet region, which comprises only a small portion, less than 5 % of solar energy. In this work, a UCNRs@TiO 2 core–shell nanostructured photocatalyst composed of NaYF 4 :30 Yb 3+ ,0.5 Tm 3+ upconversion nanorods (UCNRs) and TiO 2 nanoparticles was successfully fabricated to enhance both ultraviolet (UV) and near infrared (NIR)-responsive photocatalytic activity. The UCNRs serve as efficient optical converters, absorbing near-infrared light at 980 nm and emitting UV photons to activate TiO 2 , thereby extending its operational spectral range. Photocatalytic activity was evaluated under solar simulated irradiation by monitoring the degradation of MB at a concentration of 15 mg/L. The UCNRs@TiO 2 photocatalyst achieved a remarkable degradation efficiency of 100 % MB within 90 min with an apparent rate constant of 0.063 min −1 , in contrast to 195 min required by bare TiO 2 . In addition, the photocatalytic enhancement mechanism of UCNRs@TiO 2 materials was also proposed based on the results of Photoluminescence, UV–Vis spectra and LC-MS. The excellent stability of the composites after three cycles of reuse demonstrates their promise for the rational design of NIR-driven photocatalysts for sustainable wastewater treatment.
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Small
·
2023
·
IF 13.3
Rui Gao,Wanqing Xu,Zhiqing Wang,Fen Li,Yueli Liu,Guogang Li,Keqiang Chen
Synthesis of upconversion nanoparticles (UCNPs)-metal halide perovskites (MHPs) heterostructure is garnered immense attentions due to their unparalleled photophysical properties. However, the obvious difference in their structural forms makes it a huge challenge. Herein, hexagonal β-NaYF 4 and hexagonal Cs 4 PbBr 6 are filtrated to construct the UCNP/MHP heterostructural luminescent material. The similarity in their crystal structures facilitate the heteroepitaxial growth of Cs 4 PbBr 6 on the surface of β-NaYF 4 NPs, leading to the formation of high-quality β-NaYF 4 :Yb,Tm/Cs 4 PbBr 6 core/shell nanocrystals (NCs). Interestingly, this heterostructure endows the core/shell NCs with typically narrow-band green emission centered at 524 nm under 980 nm excitation, which should be attributed to the Förster resonance energy transfer (FRET) from Tm 3+ to Cs 4 PbBr 6 . It is noteworthy that the FRET efficiency of β-NaYF 4 :Yb,Tm/Cs 4 PbBr 6 core/shell NCs (58.33%) is much higher than that of the physically mixed sample (1.84%). In addition, the reduced defect density, lattice anchoring effect, as well as diluted ionic bonding proportion induced by the core/shell structure further increase the excellent water-resistance and thermal cycling stability of Cs 4 PbBr 6 . These findings open up a new way to construct UCNP/MHP heterostructure with better multi-code luminescence performance and stability and promote its wide optoelectronic applications.
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 28
·12201-12207
·
IF 3.288
Yan Qiao,Xionglin Zhou,Hongchao Geng,Leilei Sun,Deshuai Zhen,Qingyun Cai
A β-NaYF4:Yb,Er,Gd nanorods@1T/2H-MoS2 nanocomposite was fabricated and used for photocatalytic sterilization under illumination from single near-infrared (NIR) light. Approximately 99.3% of Escherichia coli were killed effectively by 15 min irradiation of NIR light at a dose of 40 μg mL−1. The effective bactericidal activity is ascribed to the high upconversion luminescence efficiency of β-NaYF4:Yb,Er,Gd and the layered two-dimensional nanosheet structure of 1T/2H-MoS2. Under 980 nm light irradiation, β-NaYF4:Yb,Er,Gd emits visible light, which is absorbed by MoS2, producing strongly oxidative holes and reductive electrons. Photogenerated electron–hole pairs were able to react with H2O, O2 and OH− to produce reactive species in aqueous solution. These reactive species are strong nonselective oxidizing agents for sterilization.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Zhilai Li,Omar Johnson,Jin Huang,Ting Feng,Chaoqing Yang,Zhongxin Liu,Wei Chen
Graphene oxide/NaYF 4 : Yb, Er nanocomposites have been synthesized via hydrothermal synthesis, in which spherical cubic phase NaYF 4 : Yb, Er nanocrystals with uniformity are implanted onto the surface of graphene oxide (GO). Using a near infrared laser set to 980 nm, the light-to-heat energy transfer efficiency of GO/NaYF 4 : Yb, Er is 13.9% higher than GO by itself, revealing that the photothermal conversion efficiency of GO could be enhanced by doping NaYF 4 : Yb, Er nanocrystals. This phenomenon can be attributed to the energy transfer between the NaYF 4 : Yb, Er nanocrystals to the energy receptor in the GO substrate.
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高影响因子
POWDER TECHNOLOGY
·
2012
·
IF 2.08
Wanyue Shao,Ruinian Hua,Wei Zhang,Yue Tian,Jun Zhao,Liyan Na,Jicheng Yu,Zhengang Sun
Carboxylic acid-functionalized Yb 3 + /Er 3 + co-doped α - and β -NaYF 4 nano-/micro-spheres were prepared through a simple poly(acrylic acid) (PAA)-assisted hydrothermal process. Bovine serum albumin (BSA) protein was conjugated with Yb 3 + /Er 3 + co-doped α -( β -)NaYF 4 upconversion phosphors via free carboxylic acid groups on the surface of phosphors. The final products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), infrared (IR) spectrophotometer, ultraviolet (UV) spectrophotometer and photoluminescence spectroscopy (PL). XRD results showed that pure α -NaYF 4 :Yb 3 + , Er 3 + nanospheres could be obtained via PAA assisted hydrothermal process at the pH value of 4–5 and 160 °C for 1–4 h. The obtained product is a mixture of α and β phases NaYF 4 :Yb 3 + , Er 3 + when the reaction time increased from 5 to 24 h. When the solution was treated at 200 °C for 8–24 h at the pH value of 8–9, pure β -NaYF 4 :Yb 3 + , Er 3 + microspheres were obtained. The FE-SEM results showed that the morphology of pure α -NaYF 4 :Yb 3 + , Er 3 + was spherical nanoparticles with an average diameter of about 70 nm and the pure β -NaYF 4 :Yb 3 + , Er 3 + was microsphere with an average diameter of about 700 nm, which is composed of spherical nanoparticles (30 nm). The FT-IR and UV spectra showed that BSA had been conjugated with α -NaYF 4 :Yb 3 + , Er 3 + upconversion phosphors. The luminescence properties of α -( β -) NaYF 4 :Yb 3 + , Er 3 + phosphors were also studied. Under 980 nm excitation, the upconversion luminescence (UCL) intensity of β -NaYF 4 :Yb 3 + , Er 3 + microspheres was much stronger than that of α - NaYF 4 :Yb 3 + , Er 3 + nanoparticles. Moreover, both red and green upconversion were ascribed to the two-photon process.
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高影响因子
Nanoscale
·
2015
·Vol. 8
·期 2
·1040-1048
·
IF 7.394
Xiaojuan Huang,Bo Li,Chen Peng,Guosheng Song,Yuxuan Peng,Zhiyin Xiao,Xijian Liu,Jianmao Yang,Li Yu,Junqing Hu
Imaging guided photothermal agents have attracted great attention for accurate diagnosis and treatment of tumors. Herein, multifunctional NaYF4:Yb/Er@polypyrrole (PPy) core–shell nanoplates are developed by combining a thermal decomposition reaction and a chemical oxidative polymerization reaction. Within such a composite nanomaterial, the core of the NaYF4:Yb/Er nanoplate can serve as an efficient nanoprobe for upconversion luminescence (UCL)/X-ray computed tomography (CT) dual-modal imaging, the shell of the PPy shows strong near infrared (NIR) region absorption and makes it effective in photothermal ablation of cancer cells and infrared thermal imaging in vivo. Thus, this platform can be simultaneously used for cancer diagnosis and photothermal therapy, and compensates for the deficiencies of individual imaging modalities and satisfies the higher requirements on the efficiency and accuracy for diagnosis and therapy of cancer. The results further provide some insight into the exploration of multifunctional nanocomposites in the photothermal theragnosis therapy of cancers.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Yawei Yang,Wenxiu Que,Xinyu Zhang,Xingtian Yin,Yonglei Xing,Meidan Que,Hongyang Zhao,Yaping Du
A chloroform-assistant Se dissolution in oleylamine without trioctylphosphine and alkylthiol as the green precursor was used for facile and robust synthesis of quaternary selenide nanocrystals. The S 2− modified hydrophilic Cu 2 ZnSnS 4 and Cu 2 ZnSnSe 4 nanocrystals were first prepared by a one-pot thermal decomposition route, followed by a bi-phase hydrophilic treatment process. As a proof of concept, the as-obtained hydrophilic nanocrystals were hybridized with ZnO microspheres as photosensitizers to achieve visible light-driven photocatalytic application; on the other hand, hybridized with NaYF 4 : Yb, Tm microplates to achieve near-infrared light-driven photocatalytic application. These photosensitized hybrids as photocatalysts expanded the light absorption from ultraviolet to visible even near-infrared region, which showed excellent photocatalytic Rhodamine B degradation under visible and near-infrared irradiation compared to pure ZnO and NaYF 4 : Yb, Tm, respectively. Therefore, these hydrophilic Cu 2 ZnSnS 4 and Cu 2 ZnSnSe 4 nanocrystals are proved as efficient photocatalytic sensitizers due to the efficient utilization of the visible light and emissions upconverted from near-infrared light.
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TALANTA
·
2017
·
IF 4.162
Yaoyao Zhou,Bo Ling,Hongqi Chen,Lun Wang
A novel fluorescence method for the determination of hydrogen peroxide (H 2 O 2 ) and uric acid (UA) was developed. The procedure was based on the hydroxyl radicals (·OH), which effectively quenched the fluorescence of the Mn 2+ -doped NaYF 4 :Yb,Er upconversion nanoparticles (UCNPs). Based on the property of Mn 2+ -doped NaYF 4 :Yb,Er upconversion nanoparticles, the Fenton reaction and enzymatic reaction of uric acid, this method could be used for highly sensitive detection of H 2 O 2 and uric acid. Under optimal conditions, we observed that the fluorescence quenching signal showed good linearity with the H 2 O 2 concentration in the range of 3.00 × 10 -8 M ~ 6.00×10 -5 M, and the detection limit of this assay was 1.30×10 -8 M. Meanwhile, the linear concentration range for UA was 4.00 × 10 -9 M ~ 1.00×10 -5 M, and the lower limit of detection was 1.90×10 -9 M. Furthermore, the developed method was successfully used for the determination of UA levels in human serum with satisfactory results.
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PubMed
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Journal of Nanomaterials
·
2012
·
IF 1.376
Suli Wu,Yanhui Ning,Shufen Zhang
Novel chelating ligands are very significant for preparing nanocrystals with different morphologies and applications. In this paper, we directly introduced amine groups onto UCNPs by choosing a new chelating ligand tetraethylene pentamine (TEPA) to synthesis
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Y
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:Yb, Er through hydrothermal method. The influences of rare earth concentration, the ratio of RE/TEPA, solvent composition, and reaction time on the morphology and fluorescence intensity of the as-prepared
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a
Y
F
4
:Yb, Er samples were systematically investigated and discussed. Field emission scanning electron microscopy (FE-SEM), powder X-ray diffraction (XRD), and upconversion luminescence spectroscopy were used to characterize the product. It was found that rare earth concentration, ratio of RE/TEPA, solvent composition, and reaction time were all responsible for the luminescent intensity and morphology.
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