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My Chem/Biochem


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    Quantum Dot Solutions

    Greytak group synthesizes colloidal nanocrystals and develops a novel purification techniques to purify the nanocrystals.

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    CdSe/CdS Core/Shell Quantum Dots

    We try to understand the roles of organic ligands and nanocrystal surfaces in order to improve nanocrystal performance in biological fluorescence imaging.

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    Fluorescent CdS Nanowires

    We synthesize semiconductor nanowires and focus on controlling their surfaces and compositions in order to improve their properties.

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    CdS Nanowire Field Effect Transistor Device

    We are building optical instruments for electronic transport measurement of nanomaterial-base devices.

Andrew B. Greytak Group Site

We are a research group in the Department of Chemistry and Biochemistry at the University of South Carolina.

 Our lab explores the formation, physical properties, and interfacial chemistry of nanoscale materials. Materials that we make in our lab include nanocrystal quantum dots (QDs) and semiconductor nanowires; we also examine a variety of other low-dimensional materials in collaborative projects. A strong inspiration for this work is the opportunity to impact fields including energy conversion, energy storage, bioimaging, and biomedicine.

There are two general themes that guide our choice of problems. One is an attempt to develop surface-sensitive metrics, purification strategies, and synthetic steps for QDs and other colloidal nanocrystals that permit increasingly precise and sophisticated control of the resulting physical and chemical properties. Such control is necessary for improving the performance of QD solar cells and other nanocrystal-based devices, and for advancing the biomedical applications of nanocrystal-based imaging and therapeutic agents. The second concerns the transport of matter, charge, and energy within nanoscale systems and across interfaces. We use microfabrication, optoelectronic measurements, and functional imaging techniques to characterize these transport processes. These themes are explored in several project areas.

Graduate and undergraduate students with a variety of academic interests including physical, inorganic, and organic chemistry; physics; biological sciences; and electrical engineering will be able to make strong contributions to the group’s research. Group members employ techniques including air-free synthetic chemistry, NMR spectroscopy, calorimetry, chemical vapor deposition, scanning and transmission electron microscopy, microfabrication, and photoluminescence imaging and spectroscopy. Instrument control, data analysis, and technical image analysis is done with computational tools such as Matlab and Labview.

Undergraduates interested in research opportunities should contact Prof. Greytak directly with a CV and a note regarding your professional goals. Prospective graduate students are advised to consult the Department’s graduate admissions page. Postdoc applications cannot be considered at the time of this writing due to funding constraints but should this change, a cover letter, CV, and at least two publications should be sent in hardcopy.

 

News and Highlights

Top download

Purification Review Most Downloaded Paper

Yi and Megan’s Feature Article on “Purification Technologies for Colloidal Nanocrystals” was listed among the ChemComm "Most downloaded articles of 2017: Physical and Environmental Chemistry". 

Bobby passes his defense

Congratulations Bobby Barker

Bobby Barker received his PhD! Dr. Barker defended his thesis on “Spatial Dependence Of Carrier Dynamics In Semiconductor Optoelectronic Devices” based on his work here and in his IGERT internship at Kenjiro Miyano’s lab at NIMS. He will join Prashant Kamat’s group at Notre Dame as a postdoc.

ACS Winner

Congratulations to Megan Gee

Megan spoke April 3 at the Spring 2018 Materials Research Society meeting in Phoenix, AZ. Her talk on isothermal titration calorimetry won a “Best Talk Award” in her symposium (NM12: Transitioning Quantum Dots from Benchtop to Industry). Congratulations, Megan!

SPARC

Congratulations to Preecha Kittikhunnatham

Preecha Kittikhunnatham receives SPARC Graduate Research Grant from the Office of the Vice President for research. Preecha’s project will investigate doping in colloidal semiconductor nanowires.

Andrew Greytak received Aspire III funding

Congratulations to Prof. Greytak

Prof. Greytak and Prof. MVS Chandrashekhar of USC Electrical Engineering received a grant for their project entitled, "Minority Carriers in Graphene/SiC Schottky Emitter Bipolar Phototransistors for High Gain Visible Blind UV Detection", funded by the National Science Foundation (NSF) for a total amount of $369,999.

Dr. Greytak received Aspyre grant

Congratulations to Prof. Greytak

Prof. Greytak and co-PI Prof. Thomas Makris received ASPIRE funding (ASPIRE III: Infrastructure Recipients) to establish USC Calorimetry Facility and Research Network with state of the art isothermal titration calorimetry equipment.

Abby's graduation news

Congratulations on Abigail Loszko's graduation

Abigail Loszko joined the Greytak group in 2015. She graduated in Spring 2017 with a B.S. in Biochemistry and Molecular Biology. She is going to pursue her medical degree at the University of North Carolina School of Medicine starting this Fall. We wish her best of luck.    

Cole Magellan

Congratulations to Cole Love-Baker

Cole Love-Baker received a grant from Magellan Scholar program.

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Congratulations to Abigail Loszko

Abigail Loszgo received funding from Megellan scholarship.

Prof. Greytak

Congratulations to Prof. Greytak

Prof. Greytak received a grant for his project entitled, "Equilibrium Thermodynamics of Semiconductor Nanocrystal Ligands and Ion Exchange via Calorimetry", funded by National Science Foundation (NSF) for a total amount of $409,200.00.

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Megan Gee and Prof. Andrew Greytak received a SPARC Graduate Research Grant

They have received SPARC Graduate Research Grant, for a total amount of $5,000.00, for their project entitled, "Solvent Effect on Ligand Dynamics in Colloidal QD systems."

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Congratulations on Pravin Paudel's Graduation

Pravin Paudel joined the Greytak group in 2010. He graduated in Fall 2015. He is currently a postdoctoral fellow at Arizona State University.  We wish him best of luck. 

yi

Congratulations on Yi Shen's Graduation

Yi Shen joined the Greytak group in 2010. He graduated in Fall 2015. He is currently a postdoctoral fellow at Massachusetts Institute of Technology.  We wish him best of luck.