Enhanced near infrared reflectance of TiO2/SiO2/TiO2 multilayer structure using a base-catalyzed SiO2 film

Juseok Choi; Koohee Han; Jung Hyeun Kim

doi:10.1016/j.tsf.2014.08.036

Enhanced near infrared reflectance of TiO₂/SiO₂/TiO₂ multilayer structure using a base-catalyzed SiO₂ film

Juseok Choi, Koohee Han, Jung Hyeun Kim

Department of Chemical Engineering

University of Seoul

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

Near infrared (NIR) reflective TiO₂ (high)/SiO₂ (low)/TiO₂ (high) multilayer film is fabricated by sol-gel synthesis and spin coating process. This multilayer film is used to reflect the NIR waves which can undesirably increase indoor energy of buildings while the visible waves are being transmitted. It is advantageous for high reflectance with higher value of the refractive index for the high component and lower value of the refractive index for the low component. Acid- or base-catalyzed SiO₂ film has a distinctive refractive index due to the different porous structure of the films. The base-catalyzed SiO₂ film shows much lower refractive index than the acid-catalyzed SiO₂ film, and thus the TiO₂/SiO₂/TiO₂ multilayer structure with the base-catalyzed SiO₂ film has higher NIR reflectance than the acid-catalyzed SiO₂ case. Experimentally measured reflectance for the multilayer structure is compared with the transfer matrix calculation, and the experimental results show good agreements with the model calculations. Therefore, higher NIR reflectance of TiO₂/SiO₂/TiO₂ multilayer structure can be achieved by incorporating lower refractive index SiO₂ film.

Original language	English
Pages (from-to)	100-103
Number of pages	4
Journal	Thin Solid Films
Volume	569
Issue number	C
DOIs	https://doi.org/10.1016/j.tsf.2014.08.036
State	Published - 2014

Keywords

Acid catalyst
Base catalyst
NIR reflectance
Porous silicon dioxide
Sol-gel deposition
Thin films
TiO/SiO/TiO

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10.1016/j.tsf.2014.08.036

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title = "Enhanced near infrared reflectance of TiO2/SiO2/TiO2 multilayer structure using a base-catalyzed SiO2 film",

abstract = "Near infrared (NIR) reflective TiO2 (high)/SiO2 (low)/TiO2 (high) multilayer film is fabricated by sol-gel synthesis and spin coating process. This multilayer film is used to reflect the NIR waves which can undesirably increase indoor energy of buildings while the visible waves are being transmitted. It is advantageous for high reflectance with higher value of the refractive index for the high component and lower value of the refractive index for the low component. Acid- or base-catalyzed SiO2 film has a distinctive refractive index due to the different porous structure of the films. The base-catalyzed SiO2 film shows much lower refractive index than the acid-catalyzed SiO2 film, and thus the TiO2/SiO2/TiO2 multilayer structure with the base-catalyzed SiO2 film has higher NIR reflectance than the acid-catalyzed SiO2 case. Experimentally measured reflectance for the multilayer structure is compared with the transfer matrix calculation, and the experimental results show good agreements with the model calculations. Therefore, higher NIR reflectance of TiO2/SiO2/TiO2 multilayer structure can be achieved by incorporating lower refractive index SiO2 film.",

keywords = "Acid catalyst, Base catalyst, NIR reflectance, Porous silicon dioxide, Sol-gel deposition, Thin films, TiO/SiO/TiO",

author = "Juseok Choi and Koohee Han and Kim, {Jung Hyeun}",

year = "2014",

doi = "10.1016/j.tsf.2014.08.036",

language = "English",

volume = "569",

pages = "100--103",

journal = "Thin Solid Films",

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T1 - Enhanced near infrared reflectance of TiO2/SiO2/TiO2 multilayer structure using a base-catalyzed SiO2 film

AU - Choi, Juseok

AU - Han, Koohee

AU - Kim, Jung Hyeun

PY - 2014

Y1 - 2014

N2 - Near infrared (NIR) reflective TiO2 (high)/SiO2 (low)/TiO2 (high) multilayer film is fabricated by sol-gel synthesis and spin coating process. This multilayer film is used to reflect the NIR waves which can undesirably increase indoor energy of buildings while the visible waves are being transmitted. It is advantageous for high reflectance with higher value of the refractive index for the high component and lower value of the refractive index for the low component. Acid- or base-catalyzed SiO2 film has a distinctive refractive index due to the different porous structure of the films. The base-catalyzed SiO2 film shows much lower refractive index than the acid-catalyzed SiO2 film, and thus the TiO2/SiO2/TiO2 multilayer structure with the base-catalyzed SiO2 film has higher NIR reflectance than the acid-catalyzed SiO2 case. Experimentally measured reflectance for the multilayer structure is compared with the transfer matrix calculation, and the experimental results show good agreements with the model calculations. Therefore, higher NIR reflectance of TiO2/SiO2/TiO2 multilayer structure can be achieved by incorporating lower refractive index SiO2 film.

AB - Near infrared (NIR) reflective TiO2 (high)/SiO2 (low)/TiO2 (high) multilayer film is fabricated by sol-gel synthesis and spin coating process. This multilayer film is used to reflect the NIR waves which can undesirably increase indoor energy of buildings while the visible waves are being transmitted. It is advantageous for high reflectance with higher value of the refractive index for the high component and lower value of the refractive index for the low component. Acid- or base-catalyzed SiO2 film has a distinctive refractive index due to the different porous structure of the films. The base-catalyzed SiO2 film shows much lower refractive index than the acid-catalyzed SiO2 film, and thus the TiO2/SiO2/TiO2 multilayer structure with the base-catalyzed SiO2 film has higher NIR reflectance than the acid-catalyzed SiO2 case. Experimentally measured reflectance for the multilayer structure is compared with the transfer matrix calculation, and the experimental results show good agreements with the model calculations. Therefore, higher NIR reflectance of TiO2/SiO2/TiO2 multilayer structure can be achieved by incorporating lower refractive index SiO2 film.

KW - Acid catalyst

KW - Base catalyst

KW - NIR reflectance

KW - Porous silicon dioxide

KW - Sol-gel deposition

KW - Thin films

KW - TiO/SiO/TiO

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JF - Thin Solid Films

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Enhanced near infrared reflectance of TiO₂/SiO₂/TiO₂ multilayer structure using a base-catalyzed SiO₂ film

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