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A Library of Selenourea Precursors to PbSe Nanocrystals with Size Distributions near the Homogeneous Limit (Journal Article) | OSTI.GOV

️Thu Jan 19 2017

OSTI.GOV Journal Article: A Library of Selenourea Precursors to PbSe Nanocrystals with Size Distributions near the Homogeneous Limit

Journal Article · Thu Jan 19 00:00:00 EST 2017 · Journal of the American Chemical Society

^[1]; Beecher, Alexander N. ^[1]; Walravens, Willem ^[2]; Swain, Robert A. ^[1]; Cleveland, Gregory T. ^[1]; ^[3]; ^[4]; ^[1]

Columbia Univ., New York, NY (United States)
Ghent Univ., Ghent (Belgium); Columbia Univ., New York, NY (United States)
Ghent Univ., Ghent (Belgium)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Here, we report a tunable library of N,N,N'-trisubstituted selenourea precursors and their reaction with lead oleate at 60–150 °C to form carboxylate-terminated PbSe nanocrystals in quantitative yields. Single exponential conversion kinetics can be tailored over 4 orders of magnitude by adjusting the selenourea structure. The wide range of conversion reactivity allows the extent of nucleation ([nanocrystal] = 4.6–56.7 μM) and the size following complete precursor conversion (d = 1.7–6.6 nm) to be controlled. Narrow size distributions (σ = 0.5–2%) are obtained whose spectral line widths are dominated (73–83%) by the intrinsic single particle spectral broadening, as observed using spectral hole burning measurements. Here, the intrinsic broadening decreases with increasing size (fwhm = 320–65 meV, d = 1.6–4.4 nm) that derives from exciton fine structure and exciton–phonon coupling rather than broadening caused by the size distribution.

Research Organization:

Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:

USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:

SC0012704

OSTI ID:

1437942

Report Number(s):

BNL-204649-2018-JAAM

Journal Information:

Journal of the American Chemical Society, Vol. 139, Issue 6; ISSN 0002-7863

Publisher:

American Chemical Society (ACS)Copyright Statement

Country of Publication:

United States

Language:

English

Citation information provided by
Web of Science

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A Library of Selenourea Precursors to PbSe Nanocrystals with Size Distributions near the Homogeneous Limit (Journal Article) | OSTI.GOV

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