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Sequential Infiltration Synthesis for the Design of Low Refractive Index Surface Coatings with Controllable Thickness

Journal Article · · ACS Nano
 [1];  [2];  [3];  [3];  [2];  [3]
  1. Univ. of North Texas, Denton, TX (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Chicago, IL (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
Control over refractive index and thickness of surface coatings is central to the design of low refraction films used in applications ranging from optical computing to antireflective coatings. Here, we introduce gas-phase sequential infiltration synthesis (SIS) as a robust, powerful and efficient approach to deposit conformal coatings with very low refractive indices. We demonstrate that the refractive indices of inorganic coatings can be efficiently tuned by the number of cycles used in the SIS process, composition and selective swelling of the of the polymer template. We show that the refractive index of Al2O3 can be lowered from 1.76 down to 1.1 using this method. The thickness of the Al2O3 coating can be efficiently controlled by the swelling of the block copolymer template in ethanol at elevated temperature, thereby enabling deposition of both single-layer and graded-index broadband anti-reflective coatings. Using this technique, Fresnel reflections of glass can be reduced to as low as 0.1% under normal illumination over a broad spectral range.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1439858
Alternate ID(s):
OSTI ID: 1419940
Journal Information:
ACS Nano, Journal Name: ACS Nano Journal Issue: 3 Vol. 11; ISSN 1936-0851
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (13)

Rapid Synthesis of Nanoporous Conformal Coatings via Plasma-Enhanced Sequential Infiltration of a Polymer Template journal November 2017
Nano Spray‐Dried Block Copolymer Nanoparticles and Their Transformation into Hybrid and Inorganic Nanoparticles journal March 2019
Smart Nanostructured Materials based on Self‐Assembly of Block Copolymers journal June 2019
Trimethylaluminum Diffusion in PMMA Thin Films during Sequential Infiltration Synthesis: In Situ Dynamic Spectroscopic Ellipsometric Investigation journal August 2018
Homopolymer Nanolithography journal July 2017
Review of Recent Advances in Applications of Vapor-Phase Material Infiltration Based on Atomic Layer Deposition journal September 2018
Properties and Applications of Vapor Infiltration into Polymeric Substrates journal October 2018
Mechanistic understanding of tungsten oxide in-plane nanostructure growth via sequential infiltration synthesis journal January 2018
A physiochemical processing kinetics model for the vapor phase infiltration of polymers: measuring the energetics of precursor-polymer sorption, diffusion, and reaction journal January 2018
Three-dimensional electroactive ZnO nanomesh directly derived from hierarchically self-assembled block copolymer thin films journal January 2019
The chemical physics of sequential infiltration synthesis—A thermodynamic and kinetic perspective journal November 2019
Accessibility of the pores in highly porous alumina films synthesized via sequential infiltration synthesis journal October 2018
Vapor phase infiltration: from a bioinspired process to technologic application, a prospective review journal July 2018

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