CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2013
·
IF 0.769
Yu-Rong TANG,Yu ZHANG,Rui LIU,Ying-Ying SU,Yi LÜ
The poly(acrylic acid) functionalized NaYF 4 :Yb,Er nanoparticles (NPs) were found to possess intrinsic peroxidase-like activity, which could catalyze oxidization of 3,3′,5,5′-tetramethylbiphenyl (TMB) by H 2 O 2 to produce a color variation. Using TMB as substrate, we systematically studied the effect of a series of conditions, such as temperature and pH, on the catalytic activity of NaYF 4 :Yb,Er NPs. When combined with uricase, the proposed colorimetric method could be successfully used for the determination of uric acid. Under the optimum conditions, the linear range of this method was from 1.0 × 10 −5 M to 2.0 × 10 −4 M with the detection limit down to 5.3 × 10 −6 M. Moreover, the developed method was applied to detect uric acid in serum samples and the results were in good agreement with those reported by the hospital.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2013
·
IF 2.144
Suli Wu,Yanhui Ning,Jie Chang,Shufen Zhang
Here, hydro/solvent thermal method was applied to synthesize lanthanide doped NaYF 4 upconversion nanoparticles (UCNPs). In order to overcome the quenching effect of (CH 2 ) n due to their high energy stretching vibration , a series of new chelating ligands such as, butanoic acid , hexanoic acid , decanoic acid , and tetradecanoic acid were selected for hydrothermal synthesis of NaYF 4 :Yb, Er nanocrystals . For comparison, commonly used oleic acid was also used as ligand for hydrothermal synthesis of UCNPs. The effect of the carbon chain length of chelating ligands on the NaYF 4 nanocrystals’ emission intensity was systematically investigated. It was found that relative short length of the carbon chain in chelating ligands resulted in enhancement of luminescent intensity and modulation of the ratios of green to red (RGR) of NaYF 4 :Yb, Er nanocrystals. In contrast to the product prepared with oleic acid as ligand, the enhancement factors of 540 nm emissions were 25, 21, 6.5, and 3 for samples prepared with butanoic acid, hexanoic acid, decanoic acid, and tetradecanoic acid as ligands, respectively. The FT-IR spectra of NaYF 4 :Yb, Er UCNPs prepared with different ligands indicated that ligands with relatively short chain length indeed have weak IR absorption in 2800–2950 cm −1 , which resulted in weak quenching effect of Er 3+ . We also synthesized NaYF 4 :Yb, Tm UCNPs with these ligands. The results showed that chain length of ligands has similar effect on emission intensity of NaYF 4 :Yb, Tm. It is expected that this method can also be applied to enhance the luminescence intensity of other luminescent materials.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2016
·Vol. 408
·期 14
·3823-3831
·
IF 3.125
Guo Xiaofei,Wu Shijia,Duan Nuo,Wang Zhouping
A novel aptasensor labeled with Mn 2+ -doped NaYF 4 :Yb/Er upconversion nanoparticles (NaYF 4 :Yb,Er/Mn UCNPs) was employed in electrogenerated chemiluminescence (ECL) for the sensitive detection of bisphenol A (BPA). The ECL aptasensor was assembled by immobilizing the thiolated aptamers of BPA covalently on a gold nanoparticle (AuNPs)-modified electrode and pairing with complementary DNA labeled with NaYF 4 :Yb,Er/Mn UCNPs. The ECL aptasensor can not only rapidly and accurately detect BPA concentrations from 0.05 to 100 ng/mL with a detection limit of 0.037 ng/mL but also provides a new platform for ECL applications based on the use of upconversion nanoparticles as a promising alternative material.
The NaYF4:Yb,Er/Mn UCNPs combining with the BPA aptamer serving as recognition elements create a ECL platform for the sensitive detection of bisphenol A. The change in ECL signals induced by aptamer-target interactions was measured and a significant decrease in intensity was found on interaction with BPA in the concentration range of 0.05 to 100 ng/mL.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2016
·Vol. 63
·期 12
·977-984
·
IF 0.879
Rongjin Sun,Ting Yin,Peng Huang,Guo Gao,Joseph George Shapter,Yulan Shen,Jingjing Zhang,Daxiang Cui
In this paper, we report the development of a facile one-pot hydrothermal method for the controlled synthesis of monodispersed BaGdF 5 :Yb/Er nanoparticles for computed tomography (CT) and magnetic resonance (MR) imaging. The as-prepared nanoparticles have uniform size with a diameter of 20–25 nm. MTT tests show that the cell viability surpasses 90% even with a concentration of nanoparticles of 500 µg/mL, suggesting that the as-prepared BaGdF 5 :Yb/Er nanoparticles possess low toxicity. For both BaGdF 5 :Yb/Er nanoparticles and iopromide, the Hounsfield unit (HU) values increase with the their concentration. The slope of BaGdF 5 :Yb/Er nanoparticles is about 26.47, which is much higher than that of iopromide (16.98), indicating a better CT imaging effect. Interestingly, we find that the synthesized BaGdF 5 :Yb/Er nanoparticles exhibit paramagnetism. Our in vitro and in vivo imaging experiments demonstrate that the synthesized monodispersed BaGdF 5 :Yb/Er nanoparticles can serve as effective contrast agents for CT and MR imaging.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 20
·1-13
·
IF 2.8
Liu Chen,Ji Yulong,Feng Xia,Liu Jingsong,Shen Yichun,Xia Xuerong,Wang Lixi,Zhang Qitu
Lanthanide ion-doped Sc 2 Mo 3 O 12 upconversion (UC) luminescent materials exhibit a unique negative thermal quenching phenomenon, making them highly promising for applications in fluorescence thermometry. However, the luminescence intensity of Sc 2 Mo 3 O 12 phosphor is relatively low at room temperature, so it is urgently necessary to enhance the intensity of the phosphor at room temperature. In this study, Sc 2 Mo 3 O 12 :Yb/Er/Al phosphors were synthesized via the solid-state reaction method, and the effects of Al 3+ ion doping on their phase composition and upconversion fluorescence properties were investigated by X-ray diffraction (XRD) analysis and upconversion fluorescence spectra evaluation. The results show that the incorporation of Al 3+ ions enhanced the UC intensity at room temperature and improved the fluorescence thermometry performance. The doping of Al 3+ ions disrupts the lattice symmetry and reduces the distance between sensitizer ions (Yb 3+ ) and activator ions (Er 3+ ), increasing the UC intensity by approximately 4.2 times. In addition, the dependence of fluorescence properties of ScAl 0.6 Mo 3 O 12 :18%Yb 3+ /2%Er 3+ samples on temperature were tested, the negative thermal quenching effect was verified, and the thermal enhancement mechanism was explored. The maximum absolute and relative sensitivities of the ScAl 0.6 Mo 3 O 12 :18%Yb 3+ /2%Er 3+ reached 0.00635 K −1 at 372 K and 0.00829%K −1 at 300 K, respectively, indicating the potential of the phosphor for applications in optical thermometry.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Yuanqi Qian,Huhui Fu,Yaning Zhang,Jingbing Lu,Qi Xiong,Min Liu
Potassium heptafluozirconate (K 3 ZrF 7 ) has emerged as a promising host for lanthanide-doped upconversion nanocrystals owing to its unique “soft” crystal structure, which endows it with inherent biodegradability and excellent biocompatibility. Although the ultrafast room-temperature synthesis of K 3 ZrF 7 :Yb/Er nanocrystals has been reported, morphology-controlled growth and its influence on optical properties remain insufficiently understood. In this study, we present a systematic study on the morphology-controlled synthesis of K 3 ZrF 7 :Yb/Er nanocrystals via a facile room-temperature coprecipitation method. By modulating the concentration of potassium acetate and the content of ethylene glycol, a well-defined morphological evolution from cubes to cuboctahedra and ultimately to regular octahedra was achieved, accompanied by a size reduction from the micrometer scale to sub-100 nm. The optimized octahedral nanocrystals exhibited pronounced thermally enhanced upconversion luminescence, with a 5.6-fold increase in emission intensity at 423 K compared to that at 303 K. Furthermore, based on the luminescence intensity ratio between the non-thermally coupled levels of Er 3+ ( 4 F 9/2 and 2 H 11/2 ), a high absolute sensitivity of 301.3% K −1 and the maximum relative sensitivity of 1.27% K −1 were achieved at room temperature. These findings demonstrate that morphology engineering is an effective strategy for tuning the optical and thermal properties of K 3 ZrF 7 -based nanocrystals, highlighting their great potential for high-performance optical thermometry.
✓ 已验证
产品关联
DOI
高影响因子
Nanophotonics
·
2019
·Vol. 8
·期 12
·2215-2223
·
IF 6.908
Er Pan,Gongxun Bai,Yutao Peng,Liang Chen,Shiqing Xu
Ferroelectric oxide nanocrystals, in combination with the robust coupling of an electric field with crystal structure symmetry, makes such systems agreeable to field-induced crystal structural transformation. The luminescent properties of rare earth ions are sensitive to the symmetry of the surrounding crystal field. The luminescence tuning of rare earth ions is an important assignment in the research of luminescent materials. However, the current conditional feasibility and reversibility in the exploration of luminescence modification remain major challenges. In this article, the luminescence modulation of rare earth ions has been developed in Yb 3+ /Er 3+ codoped ferroelectrics glass ceramics containing Bi 4 Ti 3 O 12 nanocrystals through an electric field. The inclusion of nanocrystals in the glass matrix greatly enhances the electrical resistance. Both upconversion and near-infrared emissions of rare earth ions are effectively enhanced more than twice via polarization engineering. The electric field regulates the photonic properties of rare earth ions with excellent reversibility and nonvolatility in ferroelectrics. The effective modification by electric field provides a new scheme for optical storage and optoelectronic devices.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Chuanying Wang,Xianhua Cheng
In this work, β-NaYF 4 :Yb,Er upconversion (UC) film was successfully prepared on silicon (Si) substrate via self-assemble method for the first time. The chemical composition and surface morphology of the UC film were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), water contact angle (WCA), X-ray power diffraction (XRD), and scanning electron microscopy (SEM) measurements. To investigate the effects of KH-560 primer film and chemical reactions on the UC luminescence properties of β-NaYF 4 :Yb,Er UC film, decay profiles of the 540 nm and 655 nm radiations were measured. Furthermore, tribological test was applied to qualitatively evaluate the adhesion of the UC film. The results indicate that the UC film has been successfully prepared on Si substrate by covalent chemical bonds. This work provides a facile way to synthesize β-NaYF 4 :Yb,Er UC film with robust adhesion to the substrate, which can be applicable for other UC films.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 85
·81542-81551
·
IF 3.289
Shuwen Zhao,Wei Liu,Xianya Xue,Yushi Yang,Zhiyong Zhao,Youfa Wang,Bin Zhou
In this work, a new strategy to enhance upconversion emission has been realized for the first time, based on β-NaGdF4:Yb3+, Er3+ nanocrystals (UCNC) using tridoping with magnesium (Mg2+) ions. X-ray diffraction (XRD) and inductively coupled plasma–atomic emission spectroscopy data indicated successful incorporation of the Mg2+ ions in β-NaGdF4:Yb3+, Er3+. The effect of the Mg2+ tridopant on the crystal structure, upconversion luminescence, and paramagnetization in β-NaGdF4:Yb3+, Er3+ was investigated in detail. The red, green and violet emission intensities were clearly enhanced and the maximum emission intensities were enhanced by about 9, 6, and 7 times, respectively, by tridoping with 13.5 mol% Mg2+ ions. The possible mechanism for enhancing upconversion emission was determined by the alteration of inter-ionic distance and the distortion of crystal structure based on the XRD data. The paramagnetic property can be modulated by the introduction of Mg2+ ions and the core–shell structure, and this can be ascribed to the change in the gadolinium molar percentage. Additionally, a synergistic effect on emission intensity enhancement was observed in a Mg2+-doped core–shell structure. At last, an improved ligand exchange method has been designed to render oleic acid-stabilized 13.5 mol% Mg2+-doped UCNCs dispersible in water and their three day cytotoxicity was assayed using stem cells. It is expected that this material could be applied in biomedical nanoprobes, bioseparation, magnetic resonance imaging, and so on.
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2012
·
IF 2.023
Zhengwen Yang,Jialun Zhu,Dong Yan,Hangjun Wu,Rongfei Wang,Zhiguo Song,Xue Yu,Yong Yang,Dacheng Zhou,Zhaoyi Yin,Jianbei Qiu
Upconversion inverse opal photonic crystals based on a luminescent matrix of Yb, Er co-doped Y 2 Ti 2 O 7 were synthesized, and their photoluminescence was investigated. By comparing the spectra of the inverse opals with that of the reference sample, the contribution of photonic band gap effect to the upconversion emission was observed in the Y 2 Ti 2 O 7 : Yb, Er inverse opals. Intensity of the green or red upconversion emission from Er 3+ was depressed when the overlapping between the photonic band-gap and Er 3+ ions emission band occurs.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 3
·1866-1872
·
IF 1.134
Li Na,Tan Haihu,Xie Shaowen,Liu Simin,Tong Chao,Ouyang Min,Xu Lijian
Upconversion nanocrystals with uniform size and hydrophilic surface have potential applications in biological medical engineering. In this study, hydrophilic NaYF4:Yb, Er nanospheres were synthesized via hexadecylpyridinium chloride (CPC) mediated hydrothermal process. The
synthesized NaYF4:Yb, Er upconversion nanospheres (UCNSs) were characterized by various characterization methods. Results showed that the synthesized UCNSs exhibited a uniform sphere-like structure with average diameter of ~250 nm. The surface of UCNSs was captured by CPC molecule
indicating hydrophilic properties of UCNSs. The spherical UCNSs composed of mixed phase (α+β) NaYF4 nanocrystals. This is the novel study for synthesis of NaYF4:Ln3+ crystal employing CPC as ligand. Moreover, the effect of CPC concentration on
synthesis of UCNSs was investigated by comparatively studying morphology, crystal phase and luminescent properties of desired sample prepared under different experimental conditions. It was found that high concentrations of CPC ligands were more favorable for forming NaYF4 crystal
nanospheres with morphology that is more regular, have smoother surface, with higher crystallinity and better upconversion fluorescent properties. The possible growing mechanism was proposed and growing of NaYF4:Yb, Er nanospheres followed the classical Ostwald ripening process.
✓ 已验证
DOI
高影响因子
Science of Advanced Materials
·
2017
·Vol. 9
·期 12
·2223-2233
·
IF 1.671
Tan Haihu,Xie Shaowen,Xu Jianxiong,Li Na,Zhang Changfang,Xu Lijian,Zheng Jie
Rational design and fabrication of multimodal imaging nanoprobes are of great significance for many imaging applications. Here, we report the systhesis of water-soluble hexagonal NaYF4:Yb, Er up-conversion phosphors (UCPs) with branched structure by hexadecylpyridinium chloride
(CPC) and tri-sodium citrate (Na3Cit) binary cationic/anionic capping agents assisted hydrothermal reaction. The crystal phase, morphology, and size of NaYF4:Yb, Er UCP were controlled by the concentration of Na3Cit and CPC, molar ratio of NaF:RE3+,
hydrothermal temperature, hydrothermal time, as well as analyzed by transmission electron microscopy (TEM), high-resolution TEM (HRTEM), X-ray diffraction (XRD). By tuning and optimizing hydrothermal conditions, NaYF4 UCPs experienced the phase transition from pure cubic phase to
mixed cubic/hexagonal phases to pure hexagonal phase, as well as morphology changes from spherical nanoparticles to short pillar structures, and ultimately to branched structures. Due to the special geometrical shape, the branched NaYF4:Yb, Er UCPs could be blended with host materials
without further surface modification. As a proof-of-concept, branched NaYF4:Yb, Er phosphors were then incorporated into polyvinyl alcohol (PVA) matrix to develop a novel luminescence composite film. The resulting PVA/NaYF4:Yb, Er composite film possessed optical transparence
at daylight and emitted green fluorescence at the irradiation of a 980 nm laser. NaYF4:Yb, Er phosphors and hybrid PVA/NaYF4:Yb, Er demonstrate high potential of fluorescent materials used for anti-counterfeiting and other optical applications.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）