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Fei Peng, Yuanyuan Su, Yiling Zhong, Yao He
Semiconductor II-VI quantum dots (QDs), as high-performance fluorescent biological probes, have garnered significant attention due to their superior optical properties. To enable QDs for wide-ranging bioapplications, concerns about their in vitro behavior need to be fully addressed. Herein, for the first time, cellular behaviors of aqueous synthesized-QDs (aqQDs), whose maximum emission wavelength (λ emission) covers the visible to near-infrared spectral window, are systematically investigated. Our results demonstrate that three different sized aqQDs feature distinct cellular distributions, i...
January 27, 2017: Nanotechnology
Yiling Zhong, Bin Song, Fei Peng, Yanyan Wu, Sicong Wu, Yuanyuan Su, Yao He
Herein, we demonstrate that at room temperature (20-25 °C) and under atmospheric pressure, small-sized (∼3.1 nm) SiNPs can be rapidly formed in aqueous phase within 60 min, with high photoluminescence quantum yield (PLQY) of ∼50%. This approach is readily scalable and could potentially be used to produce high-quality SiNPs at an industrial level.
November 10, 2016: Chemical Communications: Chem Comm
Zhilin Hu, Bin Song, Lei Xu, Yiling Zhong, Fei Peng, Xiaoyuan Ji, Fang Zhu, Chengkui Yang, Jinying Zhou, Yuanyuan Su, Suning Chen, Yao He, Sudan He
The NF-κB pathway plays crucial roles in inflammatory responses and cell survival. Aberrant constitutive NF-κB activation is associated with various human diseases including cancer and inflammatory and auto-immune diseases. Consequently, it is highly desirable to develop new kinds of inhibitors, which are highly efficacious for blocking the NF-κB pathway. In this study, by using a typical kind of aqueous synthesized quantum dots (QDs), i.e., CdTe QDs, as a model, we for the first time demonstrated that the QDs could selectively affect the cellular nuclear factor-κB (NF-κB) signaling pathway, but do not affect the AKT or ERK pathways...
November 2016: Biomaterials
Qin Wang, Yanfeng Zhou, Bin Song, Yiling Zhong, Sicong Wu, Rongrong Cui, Haixia Cong, Yuanyuan Su, Huimin Zhang, Yao He
The wide-ranging applications of fluorescent semiconductor quantum dots (QDs) have triggered increasing concerns about their biosafety. Most QD-related toxicity studies focus on the subcellular processes in cultured cells or global physiological effects on whole animals. However, it is unclear how QDs affect subcellular processes in living organisms, or how the subcellular disturbance contributes to the overall toxicity. Here the behavior and toxicity of QDs of three different sizes in Caenorhabditis elegans (C...
June 2016: Small
Bin Song, Yiling Zhong, Sicong Wu, Binbin Chu, Yuanyuan Su, Yao He
We herein report a kind of one-dimensional biocompatible fluorescent silicon nanorods (SiNRs) with tunable lengths ranging ∼100-250 nm, which can be facilely prepared through one-pot microwave synthesis. In addition to the strong fluorescence (quantum yield value: ∼15%) and negligible toxicity, the resultant SiNRs exhibit excitation wavelength-dependent photoluminescence whose maximum emission wavelength ranges from ∼450 to ∼600 nm under serial excitation wavelengths from 390 to 560 nm, providing feasibility for multicolor biological imaging...
April 13, 2016: Journal of the American Chemical Society
Yiling Zhong, Xiaotian Sun, Siyi Wang, Fei Peng, Feng Bao, Yuanyuan Su, Youyong Li, Shuit-Tong Lee, Yao He
We herein introduce a facile, low-cost photochemical method capable of rapid (<40 min) and large-quantity (∼10 g) production of highly fluorescent (quantum yield: 25%) silicon nanoparticles (SiNPs) of tunable optical properties (peak emission wavelength in the range of 470-560 nm) under ambient air conditions, by introducing 1,8-naphthalimide as a reducing agent and surface ligands. The as-prepared SiNPs feature robust storage stability and photostability preserving strong and stable fluorescent during long-term (>3 h) high-power UV irradiation, in contrast to the rapid fluorescence quenching within 2 h of conventional organic dyes and II-VI quantum dots under the same conditions...
June 23, 2015: ACS Nano
Xiaoyuan Ji, Fei Peng, Yiling Zhong, Yuanyuan Su, Yao He
The marriage of nanomaterials with biology has significantly promoted advancement of biological techniques, profoundly facilitating basic research and practical applications in biological and biomedical fields. Taking advantages of unique optical properties (e.g., strong fluorescence, robust photostability, size-tunable emission wavelengths, etc.), fluorescent quantum dots (QDs), appearing as high-performance biological fluorescent nanoprobes, have been extensively explored for a variety of biomedical optical imaging applications...
December 1, 2014: Colloids and Surfaces. B, Biointerfaces
Jie Wang, Yimei Lu, Fei Peng, Yiling Zhong, Yanfeng Zhou, Xiangxu Jiang, Yuanyuan Su, Yao He
Near-infrared (NIR, 700-900 nm) fluorescent quantum dots are highly promising as NIR bioprobes for high-resolution and high-sensitivity bioimaging applications. In this article, we present a class of NIR-emitting CdTe/CdS/ZnS core-shell-shell quantum dots (QDs), which are directly prepared in aqueous phase via a facile microwave synthesis. Significantly, the prepared NIR-emitting QDs possess excellent aqueous dispersibility, strong photoluminescence, favorable biocompatibility, robust storage-, chemical-, and photo-stability, and finely tunable emission in the NIR range (700-800 nm)...
December 2013: Biomaterials
Yiling Zhong, Fei Peng, Feng Bao, Siyi Wang, Xiaoyuan Ji, Liu Yang, Yuanyuan Su, Shuit-Tong Lee, Yao He
A large-scale synthetic strategy is developed for facile one-pot aqueous synthesis of silicon nanoparticles (SiNPs) yielding ∼0.1 g SiNPs of small sizes (∼2.2 nm) in 10 min. The as-prepared SiNPs feature strong fluorescence (photoluminescence quantum yield of 20-25%), favorable biocompatibility, and robust photo- and pH-stability. Moreover, the SiNPs are naturally water dispersible, requiring no additional post-treatment. Such SiNPs can serve as highly photostable bioprobes and are superbly suitable for long-term immunofluorescent cellular imaging...
June 5, 2013: Journal of the American Chemical Society
Yimei Lu, Yuanyuan Su, Yanfeng Zhou, Jie Wang, Fei Peng, Yiling Zhong, Qing Huang, Chunhai Fan, Yao He
Near-infrared (NIR, 700-900 nm) fluorescent nanomaterials-based probes have shown major impacts on high-resolution and high-sensitivity bioimaging applications. Typically, NIR-emitting quantum dots (QDs) are highly promising as NIR bioprobes due to their unique optical properties. However, NIR-emitting QDs-related in vivo behavior remains unknown at present, severely limiting their wide-ranging bioapplications. Herein, we investigate short- and long-term in vivo biodistribution, pharmacokinetics, and toxicity of the NIR-emitting QDs...
June 2013: Biomaterials
Yimei Lu, Yiling Zhong, Jie Wang, Yuanyuan Su, Fei Peng, Yanfeng Zhou, Xiangxu Jiang, Yao He
Over the past two decades, fluorescent quantum dots (QDs) have been highly attractive for a myriad of bioapplications due to their unique optical properties. For bioimaging applications, QD-based in vivo specific tumour targeting is vitally important in the biological and biomedical fields. Aqueous synthesized QDs (aqQDs) exhibit excellent aqueous dispersibility without requiring any post-treatment and have small hydrodynamic diameters (generally <5 nm), which are highly useful for bioimaging applications...
April 5, 2013: Nanotechnology
Guichuan Xing, Yile Liao, Xiangyang Wu, Sabyasachi Chakrabortty, Xinfeng Liu, Edwin K L Yeow, Yinthai Chan, Tze Chien Sum
Ultralow-threshold two-photon pumped amplified spontaneous emission (2ASE) and lasing in seeded CdSe/CdS nanodot/nanorod heterostructures is demonstrated for the first time. Such heterostructures allow the independent tunability of the two-photon absorption (2PA) cross-section (σ(2)) through varying the CdS rod size, and that of the emission wavelength through varying the CdSe dot size. With an enhanced σ(2), 2ASE in these heterostructures is achieved with an ultralow threshold fluence of ~1.5 mJ/cm(2), which is as much as one order less than that required for spherical semiconductor NCs...
December 21, 2012: ACS Nano
Yao He, Yiling Zhong, Fei Peng, Xinpan Wei, Yuanyuan Su, Yimei Lu, Shao Su, Wei Gu, Liangsheng Liao, Shuit-Tong Lee
Fluorescent silicon quantum dots (SiQDs) are facilely prepared via one-pot microwave-assisted synthesis. The as-prepared SiQDs feature excellent aqueous dispersibility, robust photo- and pH-stability, strong fluorescence, and favorable biocompatibility. Experiments show the SiQDs are superbly suitable for long-term immunofluorescent cellular imaging. Our results provide a new and invaluable methodology for large-scale synthesis of high-quality SiQDs, which are promising for various optoelectronic and biological applications...
September 14, 2011: Journal of the American Chemical Society
Yuanyuan Su, Fei Peng, Ziyun Jiang, Yiling Zhong, Yimei Lu, Xiangxu Jiang, Qing Huang, Chunhai Fan, Shuit-Tong Lee, Yao He
Fluorescent Ⅱ-Ⅳ Quantum dots (QDs) have demonstrated to be highly promising biological probes for various biological and biomedical applications due to their many attractive merits, such as robust photostabilty, strong photoluminescence, and size-tunable fluorescence. Along with wide ranging bioapplications, concerns about their biosafety have attracted increasingly intensive attentions. In comparison to full investigation of in vitro toxicity, there has been only scanty information regarding in vivo toxicity of the QDs...
September 2011: Biomaterials
Yao He, Yiling Zhong, Yuanyuan Su, Yimei Lu, Ziyun Jiang, Fei Peng, Tingting Xu, Shao Su, Qing Huang, Chunhai Fan, Shuit-Tong Lee
No abstract text is available yet for this article.
June 14, 2011: Angewandte Chemie
Yao He, Yiling Zhong, Fei Peng, Xinpan Wei, Yuanyuan Su, Shao Su, Wei Gu, Liangsheng Liao, Shuit-Tong Lee
No abstract text is available yet for this article.
March 21, 2011: Angewandte Chemie
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