个人简介

B.S., 1981, Zhengzhou University, China Ph.D., 1990, Iowa State University Postdoctoral Fellow, 1991-1993, Ames Laboratory, Iowa State University Faculty 1994-2005, Clark Atlanta University

研究领域

Organic & Polymer Chemistry

Research in our group is focused on the design and synthesis of novel pi-conjugated macromolecules that has potential applications in chemistry, biology, and material science. Examples of these applications include light-emitting, light-harvesting, and chemical-sensing. Luminescent Polymers A major recent development in the field of molecular electronics has been the discovery of electroluminescent conjugated polymers. Emission of bright light when excited by flow of electricity through the conjugated polymers makes these materials attractive for commercial applications such as backlights for liquid crystal displays, large screen displays, and lasers. A reliable polymeric light-emitting diode device requires the polymer emissive layer to exhibit high efficiencies in photoluminescence and electroluminescence. Our goal is to develop such materials to meet the practical requirements, through design and synthesis of new polymers with high luminescence and improved stability. The applications include light-emitting diodes and photovoltaic devices. Carbon Nanotubes Solubilizing and purifying carbon nanotubes remains one of the foremost technological barriers in realization of their potential applications. In this direction, we are interested in using soluble polymers to effectively disperse single-walled carbon nanotubes (SWNTs) into solutions. The specific conformation associated with each polymer structure could play important roles in selective interaction with different types of SWNTs. For example, poly[(m-phenylenevinylene)-alt-(p-phenylenevinylene)] forms a cavity of about 1.3 nm, which preferably wraps up the SWNT of comparable diameters (1.0-1.2 nm). The vinylene bond geometry is also found to influence the metallic tube selectivity. Chemical Sensors The luminescence signals of a probe molecule change, sometimes drastically, with the chemical environment. In this direction, we are interested in developing sensor materials that can specifically target the species of biological importance, such as zinc (II) cation, proteins and DNA. By using analyte-binding to trigger the excited state intramolecular proton transfer (ESIPT), our recent progress has led to specific recognition of pyrophosphate and various cations, which has the potential to influence the DNA sequencing.

近期论文

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Bin Liu, Qin Liu, Mickey Shah, Junfeng Wang, Ge Zhang, Yi Pang “Fluorescence monitor of hydrazine in vivo by selective deprotection of flavonoid.” Sensors and Actuators B: Chemical, submitted for publication. Junfeng Wang, Weihua Chen, Xiumin Liu, Yi Pang “A Mononuclear Zinc Complex for Selective Detection of Diphosphate via Fluorescence ESIPT Turn-On.” J. Mater. Chem. B., DOI:10.1039/C4TB00020J (accepted for publication). Bin Liu, Junfeng Wang, Ge Zhang, Ruke Bai, and Yi Pang, “A flavone-based ESIPT ratiometric chemodosimeter for detection of cysteine in living cells.” ACS Applied Materials & Interfaces, 2014, DOI 10.1021/am500102s (in press). Junfeng Wang, Yingbo Li, Ernest Duah, Sailaja Paruchuri, Demin Zhou, Yi Pang “A Selective NIR-Emitting Zinc Sensor by Using Schiff Base Binding to Turn-On Excited-State Intramolecular Proton Transfer.” J. Mater. Chem. B, 2014, 2, 2008 - 2012. http://pubs.rsc.org/en/Content/ArticleLanding/2014/TB/C3TB21339K#!divAbstract Yongqian Xu, Liangliang Xiao, Yunfei Zhang, Shiguo Sun, Yi Pang “Substituent effect on fluorophores instead of ionophores: its implication in highly selective fluorescent probe for Zn2+ over Cd2+”. RSC Advances, 2014, 4(10), 4827-4830. http://pubs.rsc.org/en/Content/ArticleLanding/2014/RA/C3RA46468G#!divAbstract Junfeng Wang, Yi Pang “A Simple Sensitive ESIPT On-Off Fluorescent Sensor for Selective Detection of Al3+ in Water,” RSC Advances, 2014, 4 (12), 5845 – 5848. http://pubs.rsc.org/en/content/articlelanding/2014/ra/c3ra47104g#!divAbstract Guangzhuo Rong, Yusheng Chen, Lei Wang, Joanne Li, Junfeng Wang, Matthew J. Panzer, Yi Pang “A Benzoxazole Sulfenamide Accelerator: Synthesis, Structure, Property and Implication in Rubber Vulcanization.” Journal of Applied Polymer Science, 2014, 131 (6), in press. (DOI:10.1002/app.39699) http://journals.ohiolink.edu/ejc/article.cgi?issn=00218995&issue=v131i0006&article=nfp_absassaiirvm Yusheng Chen, Rosi N. Gunasinghe, Xiao-Qian Wang, Yi Pang “Selective Dispersion of Single-Walled Carbon Nanotubes by a Cationic Surfactant.” RSC Advances, 2013, 3, 25097–25102. http://pubs.rsc.org/en/content/articlelanding/2013/ra/c3ra43654c/unauth#!divAbstract Yongqian Xu, Benhao Li, Liangliang Xiao, Weiwei Li, Chenyuan Zhang, Shiguo Sun, Yi Pang. “The sphere-to-rod transition of squaraine-embedded micelles: a self-assembly platform displays a distinct response to cysteine and homocystein.” Chem. Commun. 2013, 49, 7732-7734. Yongqian Xu, Benhao Li, Weiwei Li, Jie Zhao, Shiguo Sun, Yi Pang, “ICT-not-quenching” near infrared ratiometric fluorescent detection of picric acid in aqueous media.” Chem. Commun., 2013, 49, 4764-4766. http://pubs.rsc.org/en/results?searchtext=DOI%3A10.1039%2FC3CC41994K Junfeng Wang, Yi Pang, “A Versatile Synthesis of Bis[2-(2´-hydroxylphenyl)benzoxazole] Derivatives as Zinc Sensors.” RSC Advance, 2013, 3, 10208-10212. http://pubs.rsc.org/en/content/articlelanding/2013/ra/c3ra41080c Junfeng Wang, Qinghui Chu, Xiumin Liu, Chrys Wesdemiotis and Yi Pang, “Large Fluorescence Turn-On by Alcohol from a Bis(benzoxazole)-Zinc(II) Complex: The Role of Excited State Intramolecular Proton Transfer.” J. Phys. Chem. B, 2013, 117, 4127-4133. (http://pubs.acs.org/doi/pdf/10.1021/jp401612u ) Yongqian Xu , Benhao Li, Pan Han, Shiguo Sun and Yi Pang “Near-infrared fluorescent detection of glutathione via reaction-promoted assembly of squaraine-analyte adducts.” Analyst, 2013, 138, 1004-1007. (http://pubs.rsc.org/en/Content/ArticleLanding/2013/AN/C2AN36475A ) Tengfei Xiang, Xiumin Liu, Ping Yi, Mingming Guo, Chrys Wesdemiotis, Jie Xu, Yi Pang, “Schiff base polymers derived from 2,5-diformylfuran.” Polymer International, 2013, 62, 1517-1523. (http://onlinelibrary.wiley.com/doi/10.1002/pi.4452/abstract;jsessionid=74BD057D50016F2DA804B5499DA8BF17.d02t04 ) Yusheng Chen, Yongqian Xu, Qiuming Wang, Rosi N. Gunasinghe, Xiao-Qian Wang, Yi Pang “Highly Selective Dispersion of Carbon Nanotubes by Using Poly(phenyleneethynylene)-Guided Supermolecular Assembly.” Small, 2013, 9, 870-875. http://dx.doi.org/10.1002/smll.201202103 ) Yongqian Xu, Qin Liu, Xiaopeng Li, Chrys Wesdemiotis and Yi Pang, “A Zwitterionic Squaraine Dye with Large Stokes Shift for in vivo and Site-Selective Protein Sensing.” Chem. Commun., 2012, 48, 11313–11315. (http://pubs.rsc.org/en/content/articlelanding/2012/cc/c2cc36285f) Jiping Ma, Xinfei Yu, and Jie Xu, Yi Pang, “Synthesis and Crystallinity of Poly(butylene 2,5-furandicarboxylate).” Polymers, 2012, 53, 4145-4151. (http://dx.doi.org/10.1016/j.polymer.2012.07.022). Yusheng Chen, Yongqian Xu, Kelly Perry, Alexei P. Sokolov, Karren More, Yi Pang, “Achieving Diameter-Selective Separation of Single-Walled Carbon Nanotubes by Using Polymer Conformation-Confined Helical Cavity.” ACS Macro Lett., 2012, 1, 701–705. (http://pubs.acs.org/doi/abs/10.1021/mz3001308) Chenming Xue, Yongqian Xu, Yi Pang, Dingshan Yu, Liming Dai, Min Gao, Augustine Urbas and Quan Li* "Organo-Soluble Porphyrin Mixed Monolayer-Protected Gold Nanorods with Intercalated Fullerenes" Langmuir, 2012, 28, 5955-5963. Yongqian Xu, Qin Liu, Borui Dou, Brian Wright, Jingyun Wang and Yi Pang, “Zn2+ Binding-Enabled Excited State Intramolecular Proton Transfer: A Step toward New Near-Infrared Fluorescent Probes for Imaging Applications” Adv. Healthcare Mater., 2012, 1, 485-492. (http://onlinelibrary.wiley.com/doi/10.1002/adhm.201200025/abstract)