Colloidal Germanium Quantum Dots with Broadly Tunable Size and Light Emission

Jungchul Noh; Hyun Gyung Kim; Daniel W. Houck; Tushti Shah; Yangning Zhang; Alexandra Brumberg; Richard D. Schaller; Brian A. Korgel

doi:10.1021/jacs.4c13692

Colloidal Germanium Quantum Dots with Broadly Tunable Size and Light Emission

Jungchul Noh, Hyun Gyung Kim, Daniel W. Houck, Tushti Shah, Yangning Zhang, Alexandra Brumberg, Richard D. Schaller, Brian A. Korgel^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

Germanium (Ge) colloidal quantum dots (CQDs) were synthesized by thermal decomposition of GeI₂ using capping ligand mixtures of oleylamine (OAm), octadecene (ODE), and trioctylphosphine (TOP). Average diameters could be tuned across a wide range, from 3 to 18 nm, by adjusting reactant concentrations, heating rates, and reaction temperatures. OAm promotes decomposition of GeI₂ to Ge and serves as a weakly bound capping ligand. ODE displaces OAm during the reaction to terminate particle growth and prevent surface oxidation. TOP is necessary for obtaining nanocrystals larger than 11 nm. The Ge CQDs have relatively narrow size distributions and exhibit size-dependent, band-edge photoluminescence (PL), with peak energies from 0.8 to 1.34 eV, across a wide spectral range in the infrared (IR).

Original language	English (US)
Pages (from-to)	1792-1802
Number of pages	11
Journal	Journal of the American Chemical Society
Volume	147
Issue number	2
DOIs	https://doi.org/10.1021/jacs.4c13692
State	Published - Jan 15 2025

Funding

Financial support for this work was provided by the Robert A. Welch Foundation (F-1464), the National Science Foundation Industry/University Cooperative Research Center on Next Generation Photovoltaics (IIP-1540028, IIP-1822206), and the National Science Foundation (CBET-1624659). Work performed at the Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility, was supported by the U.S. DOE, Office of Basic Energy Sciences, under Contact No. DE-AC02-06CH11357. We acknowledge support of the National Science Foundation MSN Program Award CHE-2305121 (A.B. and R.D.S) and the National Science Foundation Graduate Research Fellowship Program under Grant DGE-1842165 (A.B.).

ASJC Scopus subject areas

Catalysis
General Chemistry
Biochemistry
Colloid and Surface Chemistry

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title = "Colloidal Germanium Quantum Dots with Broadly Tunable Size and Light Emission",

abstract = "Germanium (Ge) colloidal quantum dots (CQDs) were synthesized by thermal decomposition of GeI2 using capping ligand mixtures of oleylamine (OAm), octadecene (ODE), and trioctylphosphine (TOP). Average diameters could be tuned across a wide range, from 3 to 18 nm, by adjusting reactant concentrations, heating rates, and reaction temperatures. OAm promotes decomposition of GeI2 to Ge and serves as a weakly bound capping ligand. ODE displaces OAm during the reaction to terminate particle growth and prevent surface oxidation. TOP is necessary for obtaining nanocrystals larger than 11 nm. The Ge CQDs have relatively narrow size distributions and exhibit size-dependent, band-edge photoluminescence (PL), with peak energies from 0.8 to 1.34 eV, across a wide spectral range in the infrared (IR).",

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AU - Noh, Jungchul

AU - Kim, Hyun Gyung

AU - Houck, Daniel W.

AU - Shah, Tushti

AU - Zhang, Yangning

AU - Brumberg, Alexandra

AU - Schaller, Richard D.

AU - Korgel, Brian A.

PY - 2025/1/15

Y1 - 2025/1/15

N2 - Germanium (Ge) colloidal quantum dots (CQDs) were synthesized by thermal decomposition of GeI2 using capping ligand mixtures of oleylamine (OAm), octadecene (ODE), and trioctylphosphine (TOP). Average diameters could be tuned across a wide range, from 3 to 18 nm, by adjusting reactant concentrations, heating rates, and reaction temperatures. OAm promotes decomposition of GeI2 to Ge and serves as a weakly bound capping ligand. ODE displaces OAm during the reaction to terminate particle growth and prevent surface oxidation. TOP is necessary for obtaining nanocrystals larger than 11 nm. The Ge CQDs have relatively narrow size distributions and exhibit size-dependent, band-edge photoluminescence (PL), with peak energies from 0.8 to 1.34 eV, across a wide spectral range in the infrared (IR).

AB - Germanium (Ge) colloidal quantum dots (CQDs) were synthesized by thermal decomposition of GeI2 using capping ligand mixtures of oleylamine (OAm), octadecene (ODE), and trioctylphosphine (TOP). Average diameters could be tuned across a wide range, from 3 to 18 nm, by adjusting reactant concentrations, heating rates, and reaction temperatures. OAm promotes decomposition of GeI2 to Ge and serves as a weakly bound capping ligand. ODE displaces OAm during the reaction to terminate particle growth and prevent surface oxidation. TOP is necessary for obtaining nanocrystals larger than 11 nm. The Ge CQDs have relatively narrow size distributions and exhibit size-dependent, band-edge photoluminescence (PL), with peak energies from 0.8 to 1.34 eV, across a wide spectral range in the infrared (IR).

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Colloidal Germanium Quantum Dots with Broadly Tunable Size and Light Emission

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