Laser-induced enhancement of the surface hardness of nanoparticulate TiO2 self-cleaning layer

Jonghyun Kim, Jinsoo Kim, Myeongkyu Lee

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We here report that the abrasion resistance of nanoparticulate TiO2 self-cleaning layers can be highly enhanced without a considerable loss of photocatalytic capability. TiO2 coating layers solution-deposited onto the glass substrate were irradiated by a pulsed ultraviolet (UV) laser at 355nm, which modified the surface morphologies via laser-induced local melting of TiO2 nanoparticles. The surface hardness, measured by pencil scratch test, improved with increasing laser power (P). While an unmodified TiO2 layer revealed a hardness of 6B, it increased to 2H after the surface was irradiated at P=0.3W. Almost all of the stearic acid deposited on an unmodified sample disappeared after UV exposure for 12h. The photocatalytic decomposition was slowed down on laser-irradiated TiO2 surfaces and this is attributed to the reduction of specific surface areas as a result of the morphological modifications. However, a TiO2 layer hardened to 2H still exhibited fairly good photocatalytic activity, decomposing more than 75% of the stearic acid after exposure for the same duration.

Original languageEnglish
Pages (from-to)372-376
Number of pages5
JournalSurface and Coatings Technology
Volume205
Issue number2
DOIs
Publication statusPublished - 2010 Oct 1

Fingerprint

cleaning
Cleaning
Stearic acid
hardness
Hardness
Lasers
augmentation
lasers
Ultraviolet lasers
Pulsed lasers
Specific surface area
Wear resistance
Surface morphology
Melting
abrasion resistance
acids
Nanoparticles
Decomposition
Glass
Coatings

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

@article{79b4db1cf8c04442be2b840f965d7bf0,
title = "Laser-induced enhancement of the surface hardness of nanoparticulate TiO2 self-cleaning layer",
abstract = "We here report that the abrasion resistance of nanoparticulate TiO2 self-cleaning layers can be highly enhanced without a considerable loss of photocatalytic capability. TiO2 coating layers solution-deposited onto the glass substrate were irradiated by a pulsed ultraviolet (UV) laser at 355nm, which modified the surface morphologies via laser-induced local melting of TiO2 nanoparticles. The surface hardness, measured by pencil scratch test, improved with increasing laser power (P). While an unmodified TiO2 layer revealed a hardness of 6B, it increased to 2H after the surface was irradiated at P=0.3W. Almost all of the stearic acid deposited on an unmodified sample disappeared after UV exposure for 12h. The photocatalytic decomposition was slowed down on laser-irradiated TiO2 surfaces and this is attributed to the reduction of specific surface areas as a result of the morphological modifications. However, a TiO2 layer hardened to 2H still exhibited fairly good photocatalytic activity, decomposing more than 75{\%} of the stearic acid after exposure for the same duration.",
author = "Jonghyun Kim and Jinsoo Kim and Myeongkyu Lee",
year = "2010",
month = "10",
day = "1",
doi = "10.1016/j.surfcoat.2010.06.065",
language = "English",
volume = "205",
pages = "372--376",
journal = "Surface and Coatings Technology",
issn = "0257-8972",
publisher = "Elsevier",
number = "2",

}

Laser-induced enhancement of the surface hardness of nanoparticulate TiO2 self-cleaning layer. / Kim, Jonghyun; Kim, Jinsoo; Lee, Myeongkyu.

In: Surface and Coatings Technology, Vol. 205, No. 2, 01.10.2010, p. 372-376.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Laser-induced enhancement of the surface hardness of nanoparticulate TiO2 self-cleaning layer

AU - Kim, Jonghyun

AU - Kim, Jinsoo

AU - Lee, Myeongkyu

PY - 2010/10/1

Y1 - 2010/10/1

N2 - We here report that the abrasion resistance of nanoparticulate TiO2 self-cleaning layers can be highly enhanced without a considerable loss of photocatalytic capability. TiO2 coating layers solution-deposited onto the glass substrate were irradiated by a pulsed ultraviolet (UV) laser at 355nm, which modified the surface morphologies via laser-induced local melting of TiO2 nanoparticles. The surface hardness, measured by pencil scratch test, improved with increasing laser power (P). While an unmodified TiO2 layer revealed a hardness of 6B, it increased to 2H after the surface was irradiated at P=0.3W. Almost all of the stearic acid deposited on an unmodified sample disappeared after UV exposure for 12h. The photocatalytic decomposition was slowed down on laser-irradiated TiO2 surfaces and this is attributed to the reduction of specific surface areas as a result of the morphological modifications. However, a TiO2 layer hardened to 2H still exhibited fairly good photocatalytic activity, decomposing more than 75% of the stearic acid after exposure for the same duration.

AB - We here report that the abrasion resistance of nanoparticulate TiO2 self-cleaning layers can be highly enhanced without a considerable loss of photocatalytic capability. TiO2 coating layers solution-deposited onto the glass substrate were irradiated by a pulsed ultraviolet (UV) laser at 355nm, which modified the surface morphologies via laser-induced local melting of TiO2 nanoparticles. The surface hardness, measured by pencil scratch test, improved with increasing laser power (P). While an unmodified TiO2 layer revealed a hardness of 6B, it increased to 2H after the surface was irradiated at P=0.3W. Almost all of the stearic acid deposited on an unmodified sample disappeared after UV exposure for 12h. The photocatalytic decomposition was slowed down on laser-irradiated TiO2 surfaces and this is attributed to the reduction of specific surface areas as a result of the morphological modifications. However, a TiO2 layer hardened to 2H still exhibited fairly good photocatalytic activity, decomposing more than 75% of the stearic acid after exposure for the same duration.

UR - http://www.scopus.com/inward/record.url?scp=77956432701&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77956432701&partnerID=8YFLogxK

U2 - 10.1016/j.surfcoat.2010.06.065

DO - 10.1016/j.surfcoat.2010.06.065

M3 - Article

AN - SCOPUS:77956432701

VL - 205

SP - 372

EP - 376

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

SN - 0257-8972

IS - 2

ER -