Effect of Seed Age on Gold Nanorod Formation: A Microfluidic, Real-Time Investigation

Watt, John; Hance, Bradley G.; Anderson, Rachel S.; Huber, Dale L.

doi:10.1021/acs.chemmater.5b02675

Title: Effect of Seed Age on Gold Nanorod Formation: A Microfluidic, Real-Time Investigation

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Abstract

We report a real time investigation into the effect of seed age on the growth of gold nanorods using a microfluidic reaction apparatus. Through small-angle X-ray scattering (SAXS) and ultraviolet–visible spectroscopy (UV–vis) analysis, we observe the seeds aging in accordance with Ostwald ripening. A seed solution is then aged in situ and continuously injected into a microfluidic chip to initiate rod growth. We track nanorod formation in real time using in-line ultraviolet–visible and near-infrared (UV–vis–NIR) monitoring and observe a dramatic decrease in yield with increasing seed age. We then demonstrate that, by diluting the gold seed solution immediately following synthesis, the rate of aging can be reduced and nanorods synthesized continuously, in good yield. As a result, these findings suggest ultrasmall, catalytically active seeds, which are rapidly lost due to ripening and are critical for the formation of gold nanorods.

Authors:

Watt, John ^[1]; Hance, Bradley G. ^[1]; Anderson, Rachel S. ^[1]; Huber, Dale L. ^[1]

Sandia National Laboratories, Albuquerque, New Mexico 87105, United States

Publication Date:: Wed Sep 09 00:00:00 EDT 2015

Research Org.:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1214751

Alternate Identifier(s):: OSTI ID: 1214816

Grant/Contract Number:: AC04-94AL85000

Resource Type:: Published Article

Journal Name:: Chemistry of Materials

Additional Journal Information:: Journal Name: Chemistry of Materials Journal Volume: 27 Journal Issue: 18; Journal ID: ISSN 0897-4756

Publisher:: American Chemical Society

Country of Publication:: United States

Language:: English

Subject:: 77 NANOSCIENCE AND NANOTECHNOLOGY

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                    Watt, John, Hance, Bradley G., Anderson, Rachel S., and Huber, Dale L. Effect of Seed Age on Gold Nanorod Formation: A Microfluidic, Real-Time Investigation.  United States: N. p., 2015. 
Web.  doi:10.1021/acs.chemmater.5b02675.

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                    Watt, John, Hance, Bradley G., Anderson, Rachel S., & Huber, Dale L. Effect of Seed Age on Gold Nanorod Formation: A Microfluidic, Real-Time Investigation.  United States.  https://doi.org/10.1021/acs.chemmater.5b02675

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                    Watt, John, Hance, Bradley G., Anderson, Rachel S., and Huber, Dale L. Wed .  
"Effect of Seed Age on Gold Nanorod Formation: A Microfluidic, Real-Time Investigation".  United States.  https://doi.org/10.1021/acs.chemmater.5b02675.

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@article{osti_1214751,

  title        = {Effect of Seed Age on Gold Nanorod Formation: A Microfluidic, Real-Time Investigation},

  author       = {Watt, John and Hance, Bradley G. and Anderson, Rachel S. and Huber, Dale L.},

  abstractNote = {We report a real time investigation into the effect of seed age on the growth of gold nanorods using a microfluidic reaction apparatus. Through small-angle X-ray scattering (SAXS) and ultraviolet–visible spectroscopy (UV–vis) analysis, we observe the seeds aging in accordance with Ostwald ripening. A seed solution is then aged in situ and continuously injected into a microfluidic chip to initiate rod growth. We track nanorod formation in real time using in-line ultraviolet–visible and near-infrared (UV–vis–NIR) monitoring and observe a dramatic decrease in yield with increasing seed age. We then demonstrate that, by diluting the gold seed solution immediately following synthesis, the rate of aging can be reduced and nanorods synthesized continuously, in good yield. As a result, these findings suggest ultrasmall, catalytically active seeds, which are rapidly lost due to ripening and are critical for the formation of gold nanorods.},

  doi          = {10.1021/acs.chemmater.5b02675},

  journal      = {Chemistry of Materials},

  number       = 18,

  volume       = 27,

  place        = {United States},

  year         = {Wed Sep 09 00:00:00 EDT 2015},

  month        = {Wed Sep 09 00:00:00 EDT 2015}

}

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