Synthesis of cadmium sulfide Q particles in water-in-CO2 microemulsions

Justin D. Holmes; Prashant A. Bhargava; Brian A. Korgel; Keith P. Johnston

doi:10.1021/la990510a

Synthesis of cadmium sulfide Q particles in water-in-CO₂ microemulsions

Justin D. Holmes
, Prashant A. Bhargava
, Brian A. Korgel
, Keith P. Johnston

University of Texas at Austin

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

Abstract

Semiconductor nanoparticles of cadmium sulfide were synthesized in ammonium perfluoropolyether (PFPE-NH₄) stabilized water-in-CO₂ microemulsions. The particle size was tuned by varying the water-to-surfactant molar ratio (w₀): w₀ ratios of 5 and 10 yielded nanocrystals with exciton energies of 3.86 and 3.09 eV, corresponding to mean particle radii of 0.9 and 1.8 nm, respectively. These exciton energies are significantly higher than the bulk band gap energy for CdS (2.45 eV) due to quantum confinement effects. Effectively, w₀ controls the size of the compartmentalized water droplets in which the particles grow.

Original language	English
Pages (from-to)	6613-6615
Number of pages	3
Journal	Langmuir
Volume	15
Issue number	20
DOIs	https://doi.org/10.1021/la990510a
Publication status	Published - 28 Sep 1999
Externally published	Yes

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10.1021/la990510a

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title = "Synthesis of cadmium sulfide Q particles in water-in-CO2 microemulsions",

abstract = "Semiconductor nanoparticles of cadmium sulfide were synthesized in ammonium perfluoropolyether (PFPE-NH4) stabilized water-in-CO2 microemulsions. The particle size was tuned by varying the water-to-surfactant molar ratio (w0): w0 ratios of 5 and 10 yielded nanocrystals with exciton energies of 3.86 and 3.09 eV, corresponding to mean particle radii of 0.9 and 1.8 nm, respectively. These exciton energies are significantly higher than the bulk band gap energy for CdS (2.45 eV) due to quantum confinement effects. Effectively, w0 controls the size of the compartmentalized water droplets in which the particles grow.",

author = "Holmes, \{Justin D.\} and Bhargava, \{Prashant A.\} and Korgel, \{Brian A.\} and Johnston, \{Keith P.\}",

year = "1999",

month = sep,

day = "28",

doi = "10.1021/la990510a",

language = "English",

volume = "15",

pages = "6613--6615",

journal = "Langmuir",

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TY - JOUR

T1 - Synthesis of cadmium sulfide Q particles in water-in-CO2 microemulsions

AU - Holmes, Justin D.

AU - Bhargava, Prashant A.

AU - Korgel, Brian A.

AU - Johnston, Keith P.

PY - 1999/9/28

Y1 - 1999/9/28

N2 - Semiconductor nanoparticles of cadmium sulfide were synthesized in ammonium perfluoropolyether (PFPE-NH4) stabilized water-in-CO2 microemulsions. The particle size was tuned by varying the water-to-surfactant molar ratio (w0): w0 ratios of 5 and 10 yielded nanocrystals with exciton energies of 3.86 and 3.09 eV, corresponding to mean particle radii of 0.9 and 1.8 nm, respectively. These exciton energies are significantly higher than the bulk band gap energy for CdS (2.45 eV) due to quantum confinement effects. Effectively, w0 controls the size of the compartmentalized water droplets in which the particles grow.

AB - Semiconductor nanoparticles of cadmium sulfide were synthesized in ammonium perfluoropolyether (PFPE-NH4) stabilized water-in-CO2 microemulsions. The particle size was tuned by varying the water-to-surfactant molar ratio (w0): w0 ratios of 5 and 10 yielded nanocrystals with exciton energies of 3.86 and 3.09 eV, corresponding to mean particle radii of 0.9 and 1.8 nm, respectively. These exciton energies are significantly higher than the bulk band gap energy for CdS (2.45 eV) due to quantum confinement effects. Effectively, w0 controls the size of the compartmentalized water droplets in which the particles grow.

UR - https://www.scopus.com/pages/publications/0032642784

U2 - 10.1021/la990510a

DO - 10.1021/la990510a

M3 - Article

AN - SCOPUS:0032642784

SN - 0743-7463

VL - 15

SP - 6613

EP - 6615

JO - Langmuir

JF - Langmuir

IS - 20

ER -

Synthesis of cadmium sulfide Q particles in water-in-CO₂ microemulsions

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