James R. McBride

Vanderbilt University

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Sandra J. Rosenthal

Vanderbilt University

Stephen J. Pennycook

National University of Singapore

Tianquan Lian

Emory University

David J. Weiss

University of Minnesota

James F. Cahoon

University of North Carolina at Chapel Hill

Ryan M. Eustice

University of Michigan–Ann Arbor

Michael J. Bowers

Vanderbilt University

Albert D. Dukes

Physical Sciences (United States)

Andrew R. Lupini

Oak Ridge National Laboratory

Noah J. Orfield

Center for Integrated Nanotechnologies

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Vanderbilt University

153

Oak Ridge National Laboratory

University of North Carolina at Chapel Hill

University of Tennessee at Knoxville

Nashville Oncology Associates

Los Alamos National Laboratory

Emory University

Ford Motor Company (United States)

Center for Nanoscale Science and Technology

The University of Texas at Austin

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The American Statistician (1980)

James R. McBride

10.2307/2684119

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Citations (1)

The Possibility and Implications of Dynamic Nanoparticle Surfaces

ACS Nano (2013)

James R. McBride Timothy J. Pennycook Stephen J. Pennycook Sandra J. Rosenthal

Understanding the precise nature of a surface or interface is a key component toward optimizing the desired properties and function of a material. For semiconductor nanocrystals, the surface has been shown to modulate fluorescence efficiency, lifetime, and intermittency. The theoretical picture of a nanocrystal surface has included the existence of an undefined mixture of trap states that arise from incomplete passivation. However, our recent scanning transmission electron microscope movies and supporting theoretical evidence suggest that, under excitation, the surface is fluctuating, creating a dynamic population of surface and subsurface states. This possibility challenges our fundamental understanding of the surface and could have far-reaching ramifications for nanoparticle-based technologies. In this Perspective, we discuss the current theories behind the optical properties of nanocrystals in the context of fluxionality.

Passivation

Intermittency

10.1021/nn403478h

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Citations (50)

TETREST: A Fortran IV Program for Calculating Tetrachoric Correlations. Research Report 75-2.

James R. McBride David J. Weiss

Fortran

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Selenium can lift the spirits.

Agricultural Research - U.S. Department of Agriculture, Science and Education Administration. (1995)

James R. McBride

Lift (data mining)

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Bright White Light Emission from Ultrasmall Cadmium Selenide Nanocrystals

Journal of the American Chemical Society (2012)

Teresa E. Rosson Sarah M. Claiborne James R. McBride Benjamin S. Stratton Sandra J. Rosenthal

A simple treatment method using formic acid has been found to increase the fluorescence quantum yield of ultrasmall white light-emitting CdSe nanocrystals from 8% to 45%. Brighter white-light emission occurs with other carboxylic acids as well, and the magnitude of the quantum yield enhancement is shown to be dependent on the alkyl chain length. Additionally, the nanocrystal luminescence remains enhanced relative to the untreated nanocrystals over several days. This brightened emission opens the possibility for even further quantum yield improvement and potential for use of these white-light nanocrystals in solid-state lighting applications.

Quantum yield

Cadmium selenide

10.1021/ja300132p

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Citations (142)

Development of the experimental CAT-ASVAB system.

American Psychological Association eBooks (1997)

John H. Wolfe James R. McBride James B. Sympson

10.1037/10244-009

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Citations (3)

Targeting Cell Surface Receptors with Ligand-Conjugated Nanocrystals

Journal of the American Chemical Society (2002)

Sandra J. Rosenthal Ian D. Tomlinson Erika M. Adkins Sally Schroeter Scott V. Adams

To explore the potential for use of ligand-conjugated nanocrystals to target cell surface receptors, ion channels, and transporters, we explored the ability of serotonin-labeled CdSe nanocrystals (SNACs) to interact with antidepressant-sensitive, human and Drosophila serotonin transporters (hSERT, dSERT) expressed in HeLa and HEK-293 cells. Unlike unconjugated nanocrystals, SNACs were found to dose-dependently inhibit transport of radiolabeled serotonin by hSERT and dSERT, with an estimated half-maximal activity (EC50) of 33 (dSERT) and 99 μM (hSERT). When serotonin was conjugated to the nanocrystal through a linker arm (LSNACs), the EC50 for hSERT was determined to be 115 μM. Electrophysiology measurements indicated that LSNACs did not elicit currents from the serotonin-3 (5HT3) receptor but did produce currents when exposed to the transporter, which are similar to those elicited by antagonists. Moreover, fluorescent LSNACs were found to label SERT-transfected cells but did not label either nontransfected cells or transfected cells coincubated with the high-affinity SERT antagonist paroxetine. These findings support further consideration of ligand-conjugated nanocrystals as versatile probes of membrane proteins in living cells.

10.1021/ja003486s

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Citations (346)

Doping of Colloidal Nanocrystals for Optimizing Interfacial Charge Transfer: A Double-Edged Sword

Journal of the American Chemical Society (2024)

Sheng He Anji Ni Sara T. Gebre Rui Hang James R. McBride

Doping of colloidal nanocrystals offers versatile ways to improve their optoelectronic properties, with potential applications in photocatalysis and photovoltaics. However, the precise role of dopants on the interfacial charge transfer properties of nanocrystals remains poorly understood. Here, we use a Cu-doped InP@ZnSe quantum dot as a model system to investigate the dopant effects on both the intrinsic photophysics and their interfacial charge transfer by combining time-resolved transient absorption and photoluminescent spectroscopic methods. Our results revealed that the Cu dopant can cause the generation of the self-trapped exciton, which prolongs the exciton lifetime from 48.3 ± 1.7 to 369.0 ± 4.3 ns, facilitating efficient charge separation to slow electron and hole acceptors. However, hole localization into the Cu site alters their energetic levels, slowing hole transfer and accelerating charge recombination loss. This double-edged sword role of dopants in charge transfer properties is important in the future design of nanocrystals for their optoelectronic and photocatalytic applications.

Charge carrier

10.1021/jacs.4c06110

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Pinned emission from ultrasmall cadmium selenide nanocrystals

The Journal of Chemical Physics (2008)

Albert D. Dukes Michael A. Schreuder Jessica A. Sammons James R. McBride Nathanael J. Smith

We report pinning of the emission spectrum in ultrasmall CdSe nanocrystals with a diameter of 1.7 nm and smaller. It was observed that the first emission feature ceased to blueshift once the band edge absorption reached 420 nm, though the band edge absorption continued to blueshift with decreasing nanocrystal diameter.

Blueshift

Cadmium selenide

Absorption edge

Red shift

Selenide

10.1063/1.2983632

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Citations (42)

Suppressed-blinking Green (and Infrared)-emitting “Giant” Quantum Dots (gQDs): From Synthesis to Structure to Function

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2017)

Jennifer A. Hollingsworth Han Htoon James R. McBride Noah J. Orfield Nimai Mishra

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Citations (3)