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Size-controlled synthesis of monodispersed gold nanoparticles via carbon monoxide gas reduction.

Young JK, Lewinski NA, Langsner RJ, Kennedy LC, Satyanarayan A, Nammalvar V, Lin AY, Drezek RA - Nanoscale Res Lett (2011)

Bottom Line: It is also found that speciation of aqueous HAuCl4, prior to reduction, influences the size, morphology, and properties of AuNPs when reduced with CO gas.Ensemble extinction spectra and TEM images provide clear evidence that CO reduction offers a high level of monodispersity with standard deviations as low as 3%.Upon synthesis, no excess reducing agent remains in solution eliminating the need for purification.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Electrical and Computer Engineering, Rice University, MS-366, 6100 Main St,, Houston, TX 77005, USA. drezek@rice.edu.

ABSTRACT
An in depth analysis of gold nanoparticle (AuNP) synthesis and size tuning, utilizing carbon monoxide (CO) gas as a reducing agent, is presented for the first time. The sizes of the AuNPs are tunable from ~4 to 100 nm by altering the concentration of HAuCl4 and inlet CO gas-injection flow rate. It is also found that speciation of aqueous HAuCl4, prior to reduction, influences the size, morphology, and properties of AuNPs when reduced with CO gas. Ensemble extinction spectra and TEM images provide clear evidence that CO reduction offers a high level of monodispersity with standard deviations as low as 3%. Upon synthesis, no excess reducing agent remains in solution eliminating the need for purification. The time necessary to synthesize AuNPs, using CO, is less than 2 min.

No MeSH data available.


TEM images of AuNPs synthesized by CO reduction of HAuCl4. A, B, C, and D are TEM images of AuNPs synthesized without the addition of K2CO3. E and F are AuNPs synthesized from a hydrolyzed solution of aqueous HAuCl4 via the addition of K2CO3. The corresponding sizes of the AuNPs are 4, 6, 15, 25, 50, and ~100 nm respectively.
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Figure 8: TEM images of AuNPs synthesized by CO reduction of HAuCl4. A, B, C, and D are TEM images of AuNPs synthesized without the addition of K2CO3. E and F are AuNPs synthesized from a hydrolyzed solution of aqueous HAuCl4 via the addition of K2CO3. The corresponding sizes of the AuNPs are 4, 6, 15, 25, 50, and ~100 nm respectively.

Mentions: By employing a combination of gold polymer reduction and gold hydrolyzed polymer reduction, particles sizes from ~4 to 100 nm can be synthesized. Figure 8 shows a TEM micrograph illustrating the different sizes available using CO as a reducing agent. Figures 8A, B, C, D are TEM images of AuNPs synthesized without the addition of K2CO3. Figures 8E, F are AuNPs synthesized from a hydrolyzed solution of aqueous HAuCl4 via the addition of K2CO3. The corresponding sizes of the AuNPs are 4, 6, 15, 25, 50, and ~100 nm with standard deviations of 7, 13, 8, 8, 10, and 11%, respectively.


Size-controlled synthesis of monodispersed gold nanoparticles via carbon monoxide gas reduction.

Young JK, Lewinski NA, Langsner RJ, Kennedy LC, Satyanarayan A, Nammalvar V, Lin AY, Drezek RA - Nanoscale Res Lett (2011)

TEM images of AuNPs synthesized by CO reduction of HAuCl4. A, B, C, and D are TEM images of AuNPs synthesized without the addition of K2CO3. E and F are AuNPs synthesized from a hydrolyzed solution of aqueous HAuCl4 via the addition of K2CO3. The corresponding sizes of the AuNPs are 4, 6, 15, 25, 50, and ~100 nm respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211845&req=5

Figure 8: TEM images of AuNPs synthesized by CO reduction of HAuCl4. A, B, C, and D are TEM images of AuNPs synthesized without the addition of K2CO3. E and F are AuNPs synthesized from a hydrolyzed solution of aqueous HAuCl4 via the addition of K2CO3. The corresponding sizes of the AuNPs are 4, 6, 15, 25, 50, and ~100 nm respectively.
Mentions: By employing a combination of gold polymer reduction and gold hydrolyzed polymer reduction, particles sizes from ~4 to 100 nm can be synthesized. Figure 8 shows a TEM micrograph illustrating the different sizes available using CO as a reducing agent. Figures 8A, B, C, D are TEM images of AuNPs synthesized without the addition of K2CO3. Figures 8E, F are AuNPs synthesized from a hydrolyzed solution of aqueous HAuCl4 via the addition of K2CO3. The corresponding sizes of the AuNPs are 4, 6, 15, 25, 50, and ~100 nm with standard deviations of 7, 13, 8, 8, 10, and 11%, respectively.

Bottom Line: It is also found that speciation of aqueous HAuCl4, prior to reduction, influences the size, morphology, and properties of AuNPs when reduced with CO gas.Ensemble extinction spectra and TEM images provide clear evidence that CO reduction offers a high level of monodispersity with standard deviations as low as 3%.Upon synthesis, no excess reducing agent remains in solution eliminating the need for purification.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Electrical and Computer Engineering, Rice University, MS-366, 6100 Main St,, Houston, TX 77005, USA. drezek@rice.edu.

ABSTRACT
An in depth analysis of gold nanoparticle (AuNP) synthesis and size tuning, utilizing carbon monoxide (CO) gas as a reducing agent, is presented for the first time. The sizes of the AuNPs are tunable from ~4 to 100 nm by altering the concentration of HAuCl4 and inlet CO gas-injection flow rate. It is also found that speciation of aqueous HAuCl4, prior to reduction, influences the size, morphology, and properties of AuNPs when reduced with CO gas. Ensemble extinction spectra and TEM images provide clear evidence that CO reduction offers a high level of monodispersity with standard deviations as low as 3%. Upon synthesis, no excess reducing agent remains in solution eliminating the need for purification. The time necessary to synthesize AuNPs, using CO, is less than 2 min.

No MeSH data available.