Chemical Sensors Based on Amplifying Fluorescent Conjugated Polymers

Abstract

He spent 1 year as a research chemist at Eastman Kodak, after which he began graduate studies at MIT. He earned his Ph.D. in organic chemistry in 2006, under the supervision of Professor Timothy M. Swager, for studies on luminescent chemosensors. He is currently a postdoctoral fellow in the laboratory of Professor George M. Whitesides at Harvard University. Guy D. Joly obtained his B.A. degree in Chemistry from Hamline University in 1999. He earned his Ph.D. (2004) under the supervision of Professor Eric N. Jacobsen at Harvard University. His Ph.D. research focused on the discovery and development of useful asymmetric catalytic methodologies. After completing his graduate work, he moved to MIT to perform postdoctoral research with Professor Swager in the area of conjugated polymer-based sensors. His research interests broadly encompass organic chemistry, catalysis, sensing, and materials science.(3) Timothy M. Swager is the John D. MacArthur Professor of Chemistry and the Head of the Department of Chemistry at the Massachusetts Institute of Technology. A native of Montana, he received a B.S. from Montana State University in 1983 and a Ph.D. from the California Institute of Technology in 1988. His research interests are in design, synthesis, and study of organic-based electronic, sensory, and liquid crystalline materials.

Hydrogen Peroxide‐Treated Carbon Dot Phosphor with a Bathochromic‐Shifted, Aggregation‐Enhanced Emission for Light‐Emitting Devices and Visible Light Communication

“…In CD aggregates, the surface states of the CDs are coupled and their “bandgaps” are further narrowed, leading to the much broadened absorption band. As often observed for aggregated luminophores (including CDs), the coupled surface states in the aggregates open additional nonradiative channels, which lead to the aggregation induced luminescence quenching 17. As a result of the H 2 O 2 treatment, the surface of ox‐CDs becomes oxidized, which shifts the position of their surface state levels to higher energy; this is demonstrated by the enhanced absorption below 300 nm, decreased shoulder band at 450 nm, and the vanished absorption tail in the visible region (Figure 1a).…”

Conformation and physics of polymer chains: a single-molecule perspective

“…Intrachain transfer is assumed to occur only on short length scales corresponding to a few conjugated segments [22]. On the other hand, intrachain energy transfer substantially exceeding the several-segment range has been reported for conjugated polymers used as chemical sensors, with exciton diff usion lengths of more than 90 nm [23]. In the extreme case of rigid straight polymers, the wavefunction coherence length can reach micrometers in range [24].…”

Physicochemical, self-assembly and field-effect transistor properties of anti- and syn- thienoacene isomers

“…4 However, despite the rapid development in this field in recent years, there are still a number of unanswered questions. For example, although it is known that both the molecular structure and the solid-state packing of an OSC affect the charge transport properties, it is challenging to control the packing of molecules by molecular design, and it is unclear what structure and packing mode will give a high mobility.…”