skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A method for the formation of Pt metal nanoparticle arrays using nanosecond pulsed laser dewetting

Abstract

Nanosecond pulsed laser dewetting of Pt thin films, deposited on a dimpled Ta (DT) surface, has been studied here in order to form ordered Pt nanoparticle (NP) arrays. The DT substrate was fabricated via a simple electrochemical anodization process in a highly concentrated H{sub 2}SO{sub 4} and HF solution. Pt thin films (3–5 nm) were sputter coated on DT and then dewetted under vacuum to generate NPs using a 355 nm laser radiation (6–9 ns, 10 Hz). The threshold laser fluence to fully dewet a 3.5 nm thick Pt film was determined to be 300 mJ/cm{sup 2}. Our experiments have shown that shorter irradiation times (≤60 s) produce smaller nanoparticles with more uniform sizes, while longer times (>60 s) give large nanoparticles with wider size distributions. The optimum laser irradiation time of 1 s (10 pulses) has led to the formation of highly ordered Pt nanoparticle arrays with an average nanoparticle size of 26 ± 3 nm with no substrate deformation. At the optimum condition of 1 s and 500 mJ/cm{sup 2}, as many as 85% of the dewetted NPs were found neatly in the well-defined dimples. This work has demonstrated that pulsed laser dewetting of Pt thin films on a pre-patterned dimpled substrate is an efficient and powerful technique to producemore » highly ordered Pt nanoparticle arrays. This method can thus be used to produce arrays of other high-melting-point metal nanoparticles for a range of applications, including electrocatalysis, functionalized nanomaterials, and analytical purposes.« less

Authors:
; ; ;  [1];  [2]
  1. Department of Chemistry, University of Calgary, Calgary, Alberta T2N 1N4 (Canada)
  2. Institute for Technical Electrochemistry, Technische Universität München, D-85748 Garching (Germany)
Publication Date:
OSTI Identifier:
22402467
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 20; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 77 NANOSCIENCE AND NANOTECHNOLOGY; ANODIZATION; ELECTROCHEMISTRY; HYDROFLUORIC ACID; LASER RADIATION; LASERS; MELTING POINTS; NANOMATERIALS; NANOPARTICLES; PLATINUM; PULSES; SUBSTRATES; SULFURIC ACID; THIN FILMS

Citation Formats

Owusu-Ansah, Ebenezer, Horwood, Corie A., Birss, Viola I., Shi, Yujun J., E-mail: shiy@ucalgary.ca, and El-Sayed, Hany A. A method for the formation of Pt metal nanoparticle arrays using nanosecond pulsed laser dewetting. United States: N. p., 2015. Web. doi:10.1063/1.4921528.
Owusu-Ansah, Ebenezer, Horwood, Corie A., Birss, Viola I., Shi, Yujun J., E-mail: shiy@ucalgary.ca, & El-Sayed, Hany A. A method for the formation of Pt metal nanoparticle arrays using nanosecond pulsed laser dewetting. United States. doi:10.1063/1.4921528.
Owusu-Ansah, Ebenezer, Horwood, Corie A., Birss, Viola I., Shi, Yujun J., E-mail: shiy@ucalgary.ca, and El-Sayed, Hany A. Mon . "A method for the formation of Pt metal nanoparticle arrays using nanosecond pulsed laser dewetting". United States. doi:10.1063/1.4921528.
@article{osti_22402467,
title = {A method for the formation of Pt metal nanoparticle arrays using nanosecond pulsed laser dewetting},
author = {Owusu-Ansah, Ebenezer and Horwood, Corie A. and Birss, Viola I. and Shi, Yujun J., E-mail: shiy@ucalgary.ca and El-Sayed, Hany A.},
abstractNote = {Nanosecond pulsed laser dewetting of Pt thin films, deposited on a dimpled Ta (DT) surface, has been studied here in order to form ordered Pt nanoparticle (NP) arrays. The DT substrate was fabricated via a simple electrochemical anodization process in a highly concentrated H{sub 2}SO{sub 4} and HF solution. Pt thin films (3–5 nm) were sputter coated on DT and then dewetted under vacuum to generate NPs using a 355 nm laser radiation (6–9 ns, 10 Hz). The threshold laser fluence to fully dewet a 3.5 nm thick Pt film was determined to be 300 mJ/cm{sup 2}. Our experiments have shown that shorter irradiation times (≤60 s) produce smaller nanoparticles with more uniform sizes, while longer times (>60 s) give large nanoparticles with wider size distributions. The optimum laser irradiation time of 1 s (10 pulses) has led to the formation of highly ordered Pt nanoparticle arrays with an average nanoparticle size of 26 ± 3 nm with no substrate deformation. At the optimum condition of 1 s and 500 mJ/cm{sup 2}, as many as 85% of the dewetted NPs were found neatly in the well-defined dimples. This work has demonstrated that pulsed laser dewetting of Pt thin films on a pre-patterned dimpled substrate is an efficient and powerful technique to produce highly ordered Pt nanoparticle arrays. This method can thus be used to produce arrays of other high-melting-point metal nanoparticles for a range of applications, including electrocatalysis, functionalized nanomaterials, and analytical purposes.},
doi = {10.1063/1.4921528},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 20,
volume = 106,
place = {United States},
year = {2015},
month = {5}
}