Materials Chemistry Frontiers
·
2020
·Vol. 5
·期 2
·937-943
·
IF 6.788
Xupeng Gao,Xinyu Shen,Dingke Xue,Xin Li,Po Lu,Min Lu,Chunyan Li,William W. Yu,Xue Bai
Two-dimensional (2D) perovskites have become a research hotspot due to their large exciton binding energy and excellent stability. However, it is difficult to achieve longer wavelength emission than blue and green light in the 2D perovskites owing to their wide band gap resulting from their strong quantum confinement. Herein, we demonstrate a simple, efficient and low energy consumption crystallization method at room temperature to synthesize Mn2+ ion doped 2D (PEA)2PbBr4 nanocrystals (NCs) with dual-color emission centered at 410 nm from the exciton transition of the host and 600 nm from the d–d transition of Mn2+ ions. The periodic XRD peaks prove the formation of 2D perovskites. It is reassuring that the high PLQY of 54% has been achieved in the Mn2+ ion doped 2D (PEA)2PbBr4 NCs. The temperature-dependent and time-resolved spectra illustrate the efficient energy transfer from excitons to Mn2+ dopant ions. The realization of white LEDs with different color temperatures presents an opportunity and prospect for Mn2+ ion doped 2D perovskites in LED application.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2024
·
IF 2.7
Chu Cheng,Qingzhou Cheng,Wei Zhou,Yulong Chen,Wenbin Liu,Zhiling Zhang,Jingsi Ye,Pengfeng Xiao
Eliminating errors in next-generation sequencing has proven to be challenging. Here we present a novel strategy for DNA sequencing, called correctable two-color fluorogenic DNA decoding sequencing, which can significantly improve sequencing accuracy and throughput by employing a dual-nucleotide addition combined with fluorogenic sequencing-by-synthesis (SBS) chemistry. This sequencing method involves introducing a mixture of natural nucleotide X, labeled unblocked nucleotide X′, 3′ blocked nucleotide Y*, and labeled 3′ blocked nucleotide Y* into each reaction cycle. By cyclically interrogating a template twice with different nucleotide combinations, two sets of base-encoding are sequentially obtained, enabling accurate deduction of base sequence. We demonstrate the remarkable efficacy of this approach in detecting and correcting sequencing errors, achieving a theoretical error rate of 0.0005%, which is twice as accurate as Sanger sequencing. Furthermore, we show the capability to detect known mutation sites using information from only a single sequencing run. The correctable two-color fluorogenic DNA decoding sequencing approach should enable accurate identification of extremely rare genomic variations in diverse applications in biology and medicine.
研究领域:
分子生物学
·
基因组学
·
医学遗传学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 12
·7494-7507
·
IF 4.22
Zhang Rui,Yuan Yaoxin,Zhang Jianfeng,Liu Haiyun,Chen Gang,Li Kun,Hong MengQing,Zuo Wenbin,Wang Chunlan,Yang Wen,Qin Zhenxing
Mn-doped perovskite CsPb(Cl/Br) 3 nanocrystals (NCs) have been widely explored due to their unique dual-color emission characteristics, which could reduce the usage of toxic Pb and introduce the exciton emission in blue region and the stable Mn 2+ emission peak in orange-red region via energy transfer from exciton to Mn 2+ emission. Although doping high concentration Mn 2+ could increase the Mn 2+ emission, excess Mn 2+ ions would be expelled from the host perovskite lattice. Doping secondary metal Ni into the NCs as an efficient method is always used to improve the Mn 2+ emission. We adopted a one-pot halogen injection into Cs-precursor under ambient environment method to prepare (Mn, Ni): CsPbCl 3 and (Mn, Ni): CsPb(Cl/Br) 3 NCs, which introduces NiCl 2 in the Mn: CsPb(Cl/Br) 3 NCs to supply enough halide ions and to passivate defect states or traps in the perovskite NCs so as to enhance Mn 2+ emission. Density Functional Theory (DFT) calculations were also conducted to explain our experimental results, which revealed that Ni 2+ doping could eliminate the in-gap deep defects of the CsPb(Cl/Br) 3 nanocrystals. In addition, the passivated lattice defects help to improve the stability of the perovskite NCs, preventing from electron beam irradiation.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Applied Bio Materials
·
2020
·
IF 0
Bin Li,Tianhong Chen,Jhair Peña,Jinfeng Xing,Lintao Zeng
Nanoprobes with biocompatibility and strong fluorescence have unique advantages in tumor detection and diagnosis. A nanoparticle with dual fluorescent signals for detecting and imaging of tumor cells was prepared, in which the outer layer of the particle is a hyaluronic acid-modified molecule with aggregation-induced emission properties, and the inner content is the boron-dipyrromethene (BODIPY) derivative. This nanoparticle has low critical micelle concentration, small size, and high fluorescence intensity. Cell imaging experiments showed that it is capable of stable cell imaging with a red and blue fluorescence conversion in response to cancer cells. Furthermore, the zebrafish experiment confirmed that it can be used for biological imaging. Nanoparticles with dual fluorescence response properties of the coated structure provide an effective way for detecting cancer cells.
研究领域:
生物医学
·
纳米技术
·
癌症诊断
✓ 已验证
DOI
MATERIALS LETTERS
·
2025
·
IF 2.7
Yuan Zhuang,Yanhui Liu,Shirong Wang,Xianggao Li,Shuxian Meng
Electrophoretic particles enable image display in electrophoretic displays by migrating under an electric field. In this study, white hollow TiO 2 was synthesized via an improved template method, and colored hollow particles were obtained through pigment adsorption. The TiO 2 exhibited a charge of +78.08 mV and 92 % reflectivity, making it suitable for electronic paper applications. Magenta, yellow, and cyan hollow particles, all negatively charged with non-overlapping charge values, were formulated into dual-color electrophoretic suspensions. Under alternating voltage, color changes were achieved in magenta/yellow and yellow/cyan systems. This study offers new insights for dual-color and multi-color electrophoretic displays.
研究领域:
材料科学
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2019
·Vol. 144
·期 12
·3892-3897
·
IF 4.019
Xiaobin Wang,Zhishan Fang,Zhuoyi Li,Wen Ying,Danke Chen,Haiping He,Xinsheng Peng
Mercury, as one of the most prevalent toxic metals released by various natural and anthropogenic processes, causes severe pollution of soil and groundwater. In this work, R-phycoerythrin (R-PE) proteins encapsulated into ZIF-8 composite thin films were prepared via a solid-confinement conversion process and applied as fluorescent sensors for mercury ion detection. The R-PE proteins encapsulated into ZIF-8 exhibit dual color emissions including green (518 nm) and red (602, 650 nm) fluorescence, while the original orange emission (578 nm) of pure R-PE is significantly suppressed. R-PE@ZIF-8 presents excellent selectivity and sensitivity for mercury detection in a large pH range without buffer solution. Under the optimal conditions, there is a good linear relationship between the fluorescence quenching efficiencies of R-PE@ZIF-8 and logarithmic concentrations of mercury ions in the range of 0.001–50 μM with the detection limit (LOD) of 6.7 nM much lower than the guideline value given by the World Health Organization. Furthermore, multi-peak detection of R-PE@ZIF-8 improves the detection accuracy of Hg2+ concentration.
研究领域:
环境科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 31
·18368-18376
·
IF 3.119
Manyi Zhong,Zhuang Zhao,Yuan Luo,Fang Zhou,Yuehua Peng,Yanling Yin,Weichang Zhou,Dongsheng Tang
Recently, all-inorganic perovskites have attracted tremendous attention due to their excellent optoelectronic properties and extensive potential applications. However, these perovskites usually show a single emission wavelength because of the high ionic migration. Herein, we synthesized all-inorganic halide-mixed perovskite CsPbBrxI3−x microsheets with high crystal quality using the anti-solvent solution method and observed extraordinary green and red dual-color emission in single CsPbBrxI3−x microsheets. Power dependent PL spectra reveal excitonic and defect related recombination features of CsPbBr3 and CsPbI3 for the green and red emission. Temperature dependent PL spectra indicated a distinctive exciton–phonon coupling strength in CsPbBrxI3−x microsheets compared with pure CsPbBr3 and CsPbI3. The PL dynamics showing longer emission lifetime further confirmed this conclusion. Our work not only provides a novel strategy to produce stable dual-color emission integration, but also promotes the fundamental insight into the emission dynamics and exciton/free carrier related photophysics in all-inorganic halide-mixed perovskites.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Dongmei Li,Jiayue Zhou,Zhuxin Chang,Hongwei Zhao,Nan Zhang,Huan Xia,Linyuan Wang,Jie Zhao,Guanggui Yu,Zhongze Fang,Na Sai
A novel biomimetic molecular imprinted polymer chip with fluorescence (FL) and structural (STR) states, inspired by color patterns of chameleon skin, is fabricated for detecting diethylstilbestrol (DES). The chip features a regularly structured, non-closed-packed (NCP) colloidal photonic crystal (CPC) lattice made monodisperse MIP spheres containing fluorescence poly ionic liquid (FPIL) pigments. The FL color originates from FPIL pigments and is further enhanced by the Purcell effect, while the STR color results from the periodic arrangement of the NCP CPC structure. Upon the addition of DES, the molecular imprinting recognition events of the chip induce bicolored responses. These color variations are observable to the naked eye. Based on a self-correction function of colors, the chip showed direct, sensitive (as low as 0.5 ng/mL), rapid (6 min), selective and stable detection of DES. In sample analysis, the results of DES detected by the chip were by which obtained by the HPLC-MS/MS method.
研究领域:
分析化学
·
环境科学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 3
·1258-1264
·
IF 4.036
Zengchen Liu,Like Wang,Baodui Wang,Yahong Chen,Fengshou Tian,Yingying Xue,Yanxia Li,Wenping Zhu,Weijie Yang
As a class of important carbon nanomaterial, carbonized polymer dots (CPDs), also called carbon dots (CDs), have aroused wide interest owing to their unique water solubility, fluorescence properties, and rich surface functional groups. However, the directional tuning of the fluorescence properties of CPDs remains incomplete because of the influence of many factors like diameter, solvent and surface groups. Particularly, most carbonized polymer dots are synthesized in a neutral pH environment. Herein, by modulating the pH (strongly acidic or alkaline) of dextrin water solution, bicolor fluorescence emission (blue and yellow) CPDs were prepared by a hydrothermal reaction. Through systematic characterization, it was found that the different fluorescence properties are regulated by the diameters and surface groups of the carbon cores. Simultaneously, the pH value affected the nucleation process. Based on the excellent fluorescence properties, cell fluorescence imaging and cytotoxicity were tested. The bicolor fluorescence CPDs obtained by tuning the pH provide an important theoretical basis for the design of broadband CPDs.
研究领域:
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2021
·
IF 4.076
Jing Wang,Shuping Xu,Houyu Zhang,Lei Chen,Shulin Guan,Weiqing Xu
A novel strategy for constructing the organic core–shell structures/heterostructures (OCSHs) was developed by the surface doping of a charge transfer (CT) Py-TFP cocrystal (Py = pyrene; TFP = tetrafluoroterephthalonitrile) with the donor (D) or acceptor (A) replacement reaction. The lattice-selective doping of Pe (Pe = perylene) or TCNB (TCNB = 1,2,4,5-tetracyanobenzene) molecules on the Py-TFP surface resulted from both the molecular size match/mismatch and the distribution of the intermolecular hydrogen bonds. Spectroscopic analyses disclosed that the components of two types of lattice-oriented external shells, (Py-TFP)1–x(Pe-TFP)x and (Py-TFP)1–y(Py-TCNB)y, have the doping ratios of 0 < x ⩽ 2.00% and 0 < y ⩽ 4.03%, respectively. Their di-block core–shell heterostructures display the spatially segregated yellow-blue dual-color emission and the position-dependent optical waveguide with active and passive waveguide modes. Meanwhile, the Pe doped Py-TFP core–shell cocrystal presents (1,0,0) and (0,1,1) lattice-dependent emission and lightwave transmission. This study provides an effective fabrication strategy for the OCSH construction, and this core–shell cocrystallized heterojunction can be available for photonic and optoelectronic functional applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2019
·Vol. 12
·期 7
·1733-1738
·
IF 8.515
Dong Lvming,Chen Zhuo,Ye Lei,Yu Yan,Zhang Jianbing,Liu Huan,Zang Jianfeng
Mn-doped all-inorganic perovskite quantum dots (QDs) provide prominent applications in the fields of low-cost light source or display, because of their remarkable properties including dual-color emission and reduced lead content, as well as high photoluminescence quantum yields (PLQYs) and high stability. However, the existing synthesis approaches usually require hash conditions, such as high temperature and nitrogen protection, which is a major hurdler for the practical manufacturing. In addition, the significantly high Mn substitution ratio in CsPbX 3 QDs is still challenging. The real dual-color emission with two strong emission peaks in the Mn-doped all-inorganic perovskite QDs has attracted great interest. Here we present a gram-scale approach to synthesize both CsPb x Mn 1− x Cl 3 and CsPb 1− x Mn x Cl y Br 3− y QDs at 100 °C in the air with high Mn substitution ratio, up to 55.64% atomically. The as-prepared CsPb 1− x Mn x Cl y Br 3− y QDs exhibit high PLQYs of 62.41% and dual-color emission with two strong emission peaks around at 400–450 nm and 600 nm, respectively. The enhanced peak at 400–450 nm is a result of the hybrid halides in CsPbBr x Cl 3− x host. Furthermore, the unique advantage of the optical emission and high PLQYs properties of the CsPb x Mn 1 − x Cl 3 QDs has been demonstrated as invisible ink for encryption applications and polymer composites. Our gram-scale synthesis approach for Mn-doped all-inorganic perovskite QDs may boost the future research and practical applications of QDs-based white LED, spintronics, and molecular barcoding.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Z.M. Yu,L.F. Shen,D.S. Li,E.Y.B. Pun,J. Guo,H. Lin
Tb(acac) 3 (TAH) and Eu(TTA) 3 Phen (ETP) doped polyacrylonitriles (PAN) have been electrospun into heterogeneous hybrid TAH/ETP/PAN and core-shell structured [(TAH/PAN) core + (ETP/PAN) shell ] wire-shaped flexible nanofibers with diameter of ∼350 nm. Differential photon releasing behaviors reveal the double-color-emitting potential of Tb 3+ /Eu 3+ combination systems and verify the effectiveness of coaxial configuration in avoiding the cross-relaxation between different rare earth ions. Luminous fluxes of the hybrid and the coaxial systems exceed 283.5 and 326.3 μlm under the excitation of 308 nm UVB-LED pump source, respectively. By adopting coaxial electrospun configuration, the color coordinates are tuned from (0.561, 0.332) in TAH/ETP/PAN to (0.435, 0.366) in [(TAH/PAN) core + (ETP/PAN) shell ] fibers, which demonstrates that the core-shell structure is promising to extend the dimension of color tuning. Nanofibrosis and electrospun configurations furnish a desired approach to develop multifunctional one-dimensional nanomaterials for color displays and optoelectronic sensors .
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）