Size and Bandgap Control in the Solution-Phase Synthesis of Near-Infrared-Emitting Germanium Nanocrystals

Daniel A. Ruddy; Justin C. Johnson; E. Ryan Smith; Nathan R. Neale

doi:10.1021/nn102728u

Size and Bandgap Control in the Solution-Phase Synthesis of Near-Infrared-Emitting Germanium Nanocrystals

Daniel A. Ruddy, Justin C. Johnson, E. Ryan Smith, Nathan R. Neale

National Renewable Energy Laboratory

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

139 Scopus Citations

Abstract

We present a novel colloidal synthesis of alkyl-terminated Ge nanocrystals based on the reduction of GeI₄/GeI₂ mixtures. The size of the nanocrystals (2.3-11.3 nm) was controlled by adjusting both the Ge(IV)/Ge(II) ratio and the temperature ramp rate following reductant injection. The near-infrared absorption (1.6-0.70 eV) and corresponding band-edge emission demonstrate the highly tunable quantum confinement effects in Ge nanocrystals prepared using this mixed-valence precursor method. A mechanism is proposed for the observed size control, which relies upon the difference in reduction temperatures for Ge(II) versus Ge(IV).

Original language	American English
Pages (from-to)	7459-7466
Number of pages	8
Journal	ACS Nano
Volume	4
Issue number	12
DOIs	https://doi.org/10.1021/nn102728u https://doi.org/10.1021/nn102728u
State	Published - 2010

NREL Publication Number

NREL/JA-5900-49850

Keywords

bandgap control
germanium nanocrystal
infrared emission
mechanism
quantum confinement
size control

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title = "Size and Bandgap Control in the Solution-Phase Synthesis of Near-Infrared-Emitting Germanium Nanocrystals",

abstract = "We present a novel colloidal synthesis of alkyl-terminated Ge nanocrystals based on the reduction of GeI4/GeI2 mixtures. The size of the nanocrystals (2.3-11.3 nm) was controlled by adjusting both the Ge(IV)/Ge(II) ratio and the temperature ramp rate following reductant injection. The near-infrared absorption (1.6-0.70 eV) and corresponding band-edge emission demonstrate the highly tunable quantum confinement effects in Ge nanocrystals prepared using this mixed-valence precursor method. A mechanism is proposed for the observed size control, which relies upon the difference in reduction temperatures for Ge(II) versus Ge(IV).",

keywords = "bandgap control, germanium nanocrystal, infrared emission, mechanism, quantum confinement, size control",

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year = "2010",

doi = "10.1021/nn102728u",

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T1 - Size and Bandgap Control in the Solution-Phase Synthesis of Near-Infrared-Emitting Germanium Nanocrystals

AU - Ruddy, Daniel A.

AU - Johnson, Justin C.

AU - Smith, E. Ryan

AU - Neale, Nathan R.

PY - 2010

Y1 - 2010

N2 - We present a novel colloidal synthesis of alkyl-terminated Ge nanocrystals based on the reduction of GeI4/GeI2 mixtures. The size of the nanocrystals (2.3-11.3 nm) was controlled by adjusting both the Ge(IV)/Ge(II) ratio and the temperature ramp rate following reductant injection. The near-infrared absorption (1.6-0.70 eV) and corresponding band-edge emission demonstrate the highly tunable quantum confinement effects in Ge nanocrystals prepared using this mixed-valence precursor method. A mechanism is proposed for the observed size control, which relies upon the difference in reduction temperatures for Ge(II) versus Ge(IV).

AB - We present a novel colloidal synthesis of alkyl-terminated Ge nanocrystals based on the reduction of GeI4/GeI2 mixtures. The size of the nanocrystals (2.3-11.3 nm) was controlled by adjusting both the Ge(IV)/Ge(II) ratio and the temperature ramp rate following reductant injection. The near-infrared absorption (1.6-0.70 eV) and corresponding band-edge emission demonstrate the highly tunable quantum confinement effects in Ge nanocrystals prepared using this mixed-valence precursor method. A mechanism is proposed for the observed size control, which relies upon the difference in reduction temperatures for Ge(II) versus Ge(IV).

KW - bandgap control

KW - germanium nanocrystal

KW - infrared emission

KW - mechanism

KW - quantum confinement

KW - size control

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DO - 10.1021/nn102728u

M3 - Article

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AN - SCOPUS:78650719490

SN - 1936-0851

VL - 4

SP - 7459

EP - 7466

JO - ACS Nano

JF - ACS Nano

IS - 12

ER -

Size and Bandgap Control in the Solution-Phase Synthesis of Near-Infrared-Emitting Germanium Nanocrystals

Abstract

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Keywords

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