Taiqun Yang
East China Normal University
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Publication
Featured researches published by Taiqun Yang.
Journal of the American Chemical Society | 2014
Yuting Chen; Taiqun Yang; Haifeng Pan; Yufeng Yuan; Li Chen; Mengwei Liu; Kun Zhang; Sanjun Zhang; Peng Wu; Jianhua Xu
Using carboxylate-protected silver nanoclusters (Ag-carboxylate NCs) as a model, we separately investigated the contribution of the ligand shell and the metal core to understand the nature of photoluminescence of Ag NCs. A new Ag(0)NCs@Ag(I)-carboxylate complex core-shell structural model has been proposed. The emission from the Ag-carboxylate NCs could be attributed to ligand-to-metal-metal charge transfer from Ag(I)-carboxylate complexes (the oxygen atom in the carboxylate ligands to the Ag(I) ions) to the Ag atoms and subsequent radiative relaxation. Additionally, we found that the emission wavelength of the Ag NCs depends on the excitation wavelength implying a strong coupling between surface plasmon and emitter in Ag NCs. The strong coupling between the surface plasmon and the emitter determines the quantum yield and lifetime. The emission mechanism of Ag NCs and its relation to the organic templates and metal cores were clearly clarified. The results should stimulate additional experimental and theoretical research on the molecular-level design of luminescent metal probes for optoelectronics and other applications.
ACS Applied Materials & Interfaces | 2014
Ye-Jun Yu; Jun-Ling Xing; Jun-Ling Pang; Shu-Hua Jiang; Koon-Fung Lam; Taiqun Yang; Qing-Song Xue; Kun Zhang; Peng Wu
The synthesis of highly uniform mesoporous silica nanospheres (MSNs) with dendritic pore channels, particularly ones with particle sizes below 200 nm, is extremely difficult and remains a grand challenge. By a combined synthetic strategy using imidazolium ionic liquids (ILs) with different alkyl lengths as cosurfactants and Pluronic F127 nonionic surfactants as inhibitors of particle growth, the preparation of dendritic MSNs with controlled diameter between 40 and 300 nm was successfully realized. An investigation of dendritic MSNs using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and nitrogen physisorption revealed that the synthesis of dendritic MSNs at larger size (100-300 nm) strongly depends on the alkyl lengths of cationic imidazolium ILs; while the average size of dendritic MSNs can be controlled within the range of 40-100 nm by varying the amount of Pluronic F127. The Au@MSNs can be used as a catalyst for the reduction of 4-nitrophenol by NaBH4 into 4-aminophenol and exhibit excellent catalytic performance. The present discovery of the extended synthesis conditions offers reproducible, facile, and large-scale synthesis of the monodisperse spherical MSNs with precise size control and, thus, has vast prospects for future applications of ultrafine mesostructured nanoparticle materials in catalysis and biomedicine.
Analytical Chemistry | 2016
Yufeng Yuan; Xiantong Yu; Qiang Zhang; Mengfang Chang; Lei Li; Taiqun Yang; Yuting Chen; Haifeng Pan; Sanjun Zhang; Li Li; Jianhua Xu
We report silver nanoparticles (Ag NPs) with high stability, sensitivity, and no surface enhanced Raman scattering (SERS) background. The Ag NPs were synthesized via a one-step process with polysodium styrenesulfonate (PSSS) templates, and they could efficiently adsorb polycyclic aromatic molecules via π-π stacking. The adsorption mechanisms and applicability were systematically studied by experimental measurements and theoretical simulations. When the polycyclic aromatic analytes were adsorbed on the PSSS-templated Ag NPs, the vibrations of π-π stacking-bound moieties were attenuated, yet those of the other unbound aromatic moieties increased. Most importantly, when the analytes had more than two π-π stacking binding sites, the PSSS-templated Ag NPs could trap the analytes by focusing through the optical force induced or via the simultaneously formed analyte-Ag NPs aggregates. This afforded high SERS intensity and very low detection limits.
Journal of Physical Chemistry Letters | 2017
Taiqun Yang; Shan Dai; Songqiu Yang; Li Chen; Peng-Cheng Liu; Kailong Dong; Jiasheng Zhou; Yuting Chen; Haifeng Pan; Sanjun Zhang; Jinquan Chen; Kun Zhang; Peng Wu; Jianhua Xu
The fluorescence-phosphorescence dual solvoluminescence (SL) of water-soluble metal nanoclusters (NCs) at room temperature was successfully achieved by a simple solvent-stimulated strategy. The strong interaction between carboxylate ligands and the metal core at the nanoscale interface not only induces rigid conformations of carbonyl groups but also affords a perfect carbonyl cluster that acts as an exact chromophore of metal NCs for aggregation-induced emission (AIE) mechanics. The clustering of carbonyl groups bearing on the polymer backbone chain is promoted by newly discovered n → π* noncovalent interactions. The efficient delocalization of electrons in overlapped C═O double bonds between neighboring carbonyl groups triggered by strong n → π* interactions in the polymer cluster accounts for its unique SL properties, especially the abnormal phosphorescence. This was further confirmed by controlled experiments for the presence of intersystem crossing (ISC) transitions. The results provide novel insights for understanding the complex SL process and open up a new way to study the inherent mechanism of SL by broadening the application of metal NCs.
Green Chemistry | 2017
Peng-Cheng Liu; Ye-Jun Yu; Bo Peng; Shi-Yu Ma; Tian-Yu Ning; Bing-Qian Shan; Taiqun Yang; Qingsong Xue; Kun Zhang; Peng Wu
We have demonstrated a facile and green way to synthesize dendritic mesoporous silica nanoparticles (DMSNs) on an ultra-large scale (kg) with cetyltrimethylammonium bromide (CTAB) and an anionic surfactant as dual templates free of organic solvents. In contrast to its co-template role in tuning the packing parameter of the surfactant molecule organization, the anionic surfactant herein acts as a more strongly competitive counterion against the adsorption of negatively charged silicate oligomers (I−) on the micelles. Based on the new understanding of the interaction between the cationic–anionic surfactant ionic pairs and the silicate oligomers, we proposed a dual template synergistically controlled micelle self-aggregated model to understand the formation mechanism of dendritic MSNs where the anionic surfactant stabilized micelles or micelle blocks are basic self-assembling building units for the formation of center-radial pore channel networks. By using one-pot in situ isomorphous substitution, the metal Ti atom can be easily incorporated into the silica frameworks of DMSNs, and the obtained Ti-DMSN catalyst shows a superior catalytic performance in the epoxidation of cyclohexene over the typical mesoporous Ti-MCM-41 silicas.
International Journal of Nanomedicine | 2018
Xiantong Yu; Xiaoxiao He; Taiqun Yang; Litao Zhao; Qichen Chen; Sanjun Zhang; Jinquan Chen; Jianhua Xu
Background Dopamine (DA) is an important neurotransmitter in the hypothalamus and pituitary gland, which can produce a direct influence on mammals’ emotions in midbrain. Additionally, the level of DA is highly related with some important neurologic diseases such as schizophrenia, Parkinson, and Huntington’s diseases, etc. In light of the important roles that DA plays in the disease modulation, it is of considerable significance to develop a sensitive and reproducible approach for monitoring DA. Purpose The objective of this study was to develop an efficient approach to quantitatively monitor the level of DA using Ag nanoparticle (NP) dimers and enhanced Raman spectroscopy. Methods Ag NP dimers were synthesized for the sensitive detection of DA via surface-enhanced Raman scattering (SERS). Citrate was used as both the capping agent of NPs and sensing agent to DA, which is self-assembled on the surface of Ag NP dimers by reacting with the surface carboxyl group to form a stable amide bond. To improve accuracy and precision, the multiplicative effects model for surface-enhanced Raman spectroscopy was utilized to analyze the SERS assays. Results A low limits of detection (LOD) of 20 pM and a wide linear response range from 30 pM to 300 nM were obtained for DA quantitative detection. The SERS enhancement factor was theoretically valued at approximately 107 by discrete dipole approximation. DA was self-assembled on the citrate capped surface of Ag NPs dimers through the amide bond. The adsorption energy was estimated to be 256 KJ/mol using the Langmuir isotherm model. The density functional theory was used to simulate the spectral characteristics of SERS during the adsorption of DA on the surface of the Ag dimers. Furthermore, to improve the accuracy and precision of quantitative analysis of SERS assays with a multiplicative effects model for surface-enhanced Raman spectroscopy. Conclusion A LOD of 20 pM DA-level was obtained, and the linear response ranged from 30 pM to 300 nM for quantitative DA detection. The absolute relative percentage error was 4.22% between the real and predicted DA concentrations. This detection scheme is expected to have good applications in the prevention and diagnosis of certain diseases caused by disorders in the DA level.
Applied Spectroscopy | 2018
Kailong Dong; Jiasheng Zhou; Taiqun Yang; Shan Dai; Hao Tan; Yuting Chen; Haifeng Pan; Jinquan Chen; Benjamin Audit; Sanjun Zhang; Jianhua Xu
In this study, we report a straightforward strategy for Hg2+ ion detection. Fluorescent Au nanoparticles (NPs) were one-pot synthesized using a polymer (polyvinyl pyrrolidone [PVP]) as both capping and fluorescence agent. The as-synthesized PVP-Au NPs showed a remarkably rapid response selectively for Hg2+ ions compared to 14 other metal ions. The detection limit of Hg2+ was estimated at 100 nM. We discuss the emission and quenching mechanism of the PVP-Au NPs, the former being attributed to metal enhanced fluorescence and the latter being related to static quenching by Hg2+. The fluorescence of PVP-Au NPs offers an efficient and reliable strategy for Hg2+ ions detection. They therefore have a great potential for applications in health and environmental monitoring.
Microporous and Mesoporous Materials | 2014
Xiaojing Ma; Ye-Jun Yu; Jun-Ling Xing; Taiqun Yang; Koon Fung Lam; Qing-Song Xue; Belén Albela; Laurent Bonneviot; Kun Zhang
Biophysical Journal | 2015
Taiqun Yang; Yuting Chen; Kun Zhang; Kehan Huang; Haifeng Pan; Sanjun Zhang; Jianhua Xu
Chemistry: A European Journal | 2018
Kun Zhang; Taiqun Yang; Bing-Qian Shan; Peng-Cheng Liu; Bo Peng; Qing-Song Xue; En-Hui Yuan; Peng Wu; Belén Albela; Laurent Bonneviot