Next Article in Journal
An Investigation of Polyoxometalate Hybrid Materials as Patternable Dielectrics and Lithographic Resists
Next Article in Special Issue
Growth of Anisotropic Gold Nanoparticle Assemblies via Liposome Fusion
Previous Article in Journal
Morphological Transition in Diamond Thin-Films Induced by Boron in a Microwave Plasma Deposition Process
Previous Article in Special Issue
Assembly Modulated by Particle Position and Shape: A New Concept in Self-Assembly
Open AccessArticle

Modifying the Morphology of Silicon Surfaces by Laser Induced Liquid Assisted Colloidal Lithography

School of Chemistry, University of Bristol, Bristol BS8 1TS, UK
Cardiff School of Engineering, Cardiff University, Cardiff CF24 3AA, UK
School of Engineering, University of Portsmouth, Portsmouth PO1 3DJ, UK
Author to whom correspondence should be addressed.
Materials 2017, 10(11), 1306;
Received: 13 October 2017 / Revised: 8 November 2017 / Accepted: 10 November 2017 / Published: 14 November 2017
(This article belongs to the Special Issue Designed Colloidal Self-Assembly)
Single, or isolated small arrays of, spherical silica colloidal particles (with refractive index ncolloid = 1.47 and radius R = 350 nm or 1.5 μm) were placed on a silicon substrate and immersed in carbon tetrachloride (nliquid = 1.48) or toluene (nliquid = 1.52). Areas of the sample were then exposed to a single laser pulse (8 ps duration, wavelength λ = 355 nm), and the spatial intensity modulation of the near field in the vicinity of the particles revealed via the resulting patterning of the substrate surface. In this regime, ncolloid < nliquid and the near-field optical intensification is concentrated at and beyond the edge of the particle. Detailed experimental characterization of the irradiated Si surface using atomic force microscopy reveals contrasting topographies. The same optical behavior is observed with both liquids, i.e., the incident laser light diverges on interaction with the colloidal particle, but the resulting interaction with the substrate is liquid dependent. Topographic analysis indicates localized ablation and patterning of the Si substrate when using toluene, whereas the patterning induced under carbon tetrachloride is on a larger scale and extends well below the original substrate surface—hinting at a laser induced photochemical contribution to the surface patterning. View Full-Text
Keywords: colloids; laser processing; patterning; liquid induced photochemistry colloids; laser processing; patterning; liquid induced photochemistry
Show Figures

Figure 1

MDPI and ACS Style

Ulmeanu, M.; Harniman, R.L.; Petkov, P.; Ashfold, M.N.R. Modifying the Morphology of Silicon Surfaces by Laser Induced Liquid Assisted Colloidal Lithography. Materials 2017, 10, 1306.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Search more from Scilit
Back to TopTop