Bandgap engineering of TiO2 nanoparticles through MeV Cu ions irradiation

Ishaq Ahmad; Muhammad Usman; Ting kai Zhao; Sara Qayum; Iram Mahmood; Arshad Mahmood; Abdoulaye Diallo; Camillus Obayi; Fabian Ifeanyichukwu Ezema; Malik Maaza

doi:10.1016/j.arabjc.2018.11.008

Bandgap engineering of TiO₂ nanoparticles through MeV Cu ions irradiation

Ishaq Ahmad, Muhammad Usman, Ting kai Zhao, Sara Qayum, Iram Mahmood, Arshad Mahmood, Abdoulaye Diallo, Camillus Obayi, Fabian Ifeanyichukwu Ezema, Malik Maaza

School of Materials Sience and Engineering

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

15 Scopus citations

Abstract

The effect of 5 MeV Cu⁺⁺ ions irradiation on structural and optical properties of Anatase TiO₂ nanoparticles (TiO₂-NPs) is investigated. For this purpose, TiO₂-NPs are irradiated with different Cu⁺⁺ ions fluences, ranging from 1 × 10¹⁵ to 1 × 10¹⁶ ions/cm² at room temperature. XRD results confirm the Ti₃O₇ phase appear at the dose of 5 × 10¹⁵ ions/cm² and peak intensity of Ti₃O₇ phase gradually increases with an increase of Cu⁺⁺ ions irradiation dose. At the dose of 1 × 10¹⁶ ions/cm² TiO₂ Anatase phase were transformed to Rutile phase. Same observations are confirmed from Raman spectroscopy. High resolution transmission electron microscopy (HRTEM) reveals that morphology converted into wavy shape and crystal structure detrioted with increase Cu ion irradiation dose to form vacancy loops and interstitial loops. Scanning electron microscopy (SEM) shows that TiO₂-NPs have been fused to form a cluster of nanoparticles at high Cu ion beam dose, while bandgap of TiO₂-NPs reduces from 3.19 eV to 2.96 eV as a function of Cu⁺⁺ irradiation fluence. These phase transformations and crystal damage are the responsible for optical bandgap reduction. The mechanism for the currently observed phase transformation of TiO₂ and coalescence of TiO₂-NPs are discussed in term of thermal spikes model.

Original language	English
Pages (from-to)	3344-3350
Number of pages	7
Journal	Arabian Journal of Chemistry
Volume	13
Issue number	1
DOIs	https://doi.org/10.1016/j.arabjc.2018.11.008
State	Published - Jan 2020

Keywords

Bandgap engineering
Coalescence of NPs
Cu irradiation
Rutile phase
TiO nanoparticles

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10.1016/j.arabjc.2018.11.008

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@article{730780f073bc45fa8dfe80511b1df78c,

title = "Bandgap engineering of TiO2 nanoparticles through MeV Cu ions irradiation",

abstract = "The effect of 5 MeV Cu++ ions irradiation on structural and optical properties of Anatase TiO2 nanoparticles (TiO2-NPs) is investigated. For this purpose, TiO2-NPs are irradiated with different Cu++ ions fluences, ranging from 1 × 1015 to 1 × 1016 ions/cm2 at room temperature. XRD results confirm the Ti3O7 phase appear at the dose of 5 × 1015 ions/cm2 and peak intensity of Ti3O7 phase gradually increases with an increase of Cu++ ions irradiation dose. At the dose of 1 × 1016 ions/cm2 TiO2 Anatase phase were transformed to Rutile phase. Same observations are confirmed from Raman spectroscopy. High resolution transmission electron microscopy (HRTEM) reveals that morphology converted into wavy shape and crystal structure detrioted with increase Cu ion irradiation dose to form vacancy loops and interstitial loops. Scanning electron microscopy (SEM) shows that TiO2-NPs have been fused to form a cluster of nanoparticles at high Cu ion beam dose, while bandgap of TiO2-NPs reduces from 3.19 eV to 2.96 eV as a function of Cu++ irradiation fluence. These phase transformations and crystal damage are the responsible for optical bandgap reduction. The mechanism for the currently observed phase transformation of TiO2 and coalescence of TiO2-NPs are discussed in term of thermal spikes model.",

keywords = "Bandgap engineering, Coalescence of NPs, Cu irradiation, Rutile phase, TiO nanoparticles",

author = "Ishaq Ahmad and Muhammad Usman and Zhao, {Ting kai} and Sara Qayum and Iram Mahmood and Arshad Mahmood and Abdoulaye Diallo and Camillus Obayi and Ezema, {Fabian Ifeanyichukwu} and Malik Maaza",

note = "Publisher Copyright: {\textcopyright} 2018 King Saud University",

year = "2020",

month = jan,

doi = "10.1016/j.arabjc.2018.11.008",

language = "英语",

volume = "13",

pages = "3344--3350",

journal = "Arabian Journal of Chemistry",

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T1 - Bandgap engineering of TiO2 nanoparticles through MeV Cu ions irradiation

AU - Ahmad, Ishaq

AU - Usman, Muhammad

AU - Zhao, Ting kai

AU - Qayum, Sara

AU - Mahmood, Iram

AU - Mahmood, Arshad

AU - Diallo, Abdoulaye

AU - Obayi, Camillus

AU - Ezema, Fabian Ifeanyichukwu

AU - Maaza, Malik

PY - 2020/1

Y1 - 2020/1

N2 - The effect of 5 MeV Cu++ ions irradiation on structural and optical properties of Anatase TiO2 nanoparticles (TiO2-NPs) is investigated. For this purpose, TiO2-NPs are irradiated with different Cu++ ions fluences, ranging from 1 × 1015 to 1 × 1016 ions/cm2 at room temperature. XRD results confirm the Ti3O7 phase appear at the dose of 5 × 1015 ions/cm2 and peak intensity of Ti3O7 phase gradually increases with an increase of Cu++ ions irradiation dose. At the dose of 1 × 1016 ions/cm2 TiO2 Anatase phase were transformed to Rutile phase. Same observations are confirmed from Raman spectroscopy. High resolution transmission electron microscopy (HRTEM) reveals that morphology converted into wavy shape and crystal structure detrioted with increase Cu ion irradiation dose to form vacancy loops and interstitial loops. Scanning electron microscopy (SEM) shows that TiO2-NPs have been fused to form a cluster of nanoparticles at high Cu ion beam dose, while bandgap of TiO2-NPs reduces from 3.19 eV to 2.96 eV as a function of Cu++ irradiation fluence. These phase transformations and crystal damage are the responsible for optical bandgap reduction. The mechanism for the currently observed phase transformation of TiO2 and coalescence of TiO2-NPs are discussed in term of thermal spikes model.

AB - The effect of 5 MeV Cu++ ions irradiation on structural and optical properties of Anatase TiO2 nanoparticles (TiO2-NPs) is investigated. For this purpose, TiO2-NPs are irradiated with different Cu++ ions fluences, ranging from 1 × 1015 to 1 × 1016 ions/cm2 at room temperature. XRD results confirm the Ti3O7 phase appear at the dose of 5 × 1015 ions/cm2 and peak intensity of Ti3O7 phase gradually increases with an increase of Cu++ ions irradiation dose. At the dose of 1 × 1016 ions/cm2 TiO2 Anatase phase were transformed to Rutile phase. Same observations are confirmed from Raman spectroscopy. High resolution transmission electron microscopy (HRTEM) reveals that morphology converted into wavy shape and crystal structure detrioted with increase Cu ion irradiation dose to form vacancy loops and interstitial loops. Scanning electron microscopy (SEM) shows that TiO2-NPs have been fused to form a cluster of nanoparticles at high Cu ion beam dose, while bandgap of TiO2-NPs reduces from 3.19 eV to 2.96 eV as a function of Cu++ irradiation fluence. These phase transformations and crystal damage are the responsible for optical bandgap reduction. The mechanism for the currently observed phase transformation of TiO2 and coalescence of TiO2-NPs are discussed in term of thermal spikes model.

KW - Bandgap engineering

KW - Coalescence of NPs

KW - Cu irradiation

KW - Rutile phase

KW - TiO nanoparticles

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DO - 10.1016/j.arabjc.2018.11.008

M3 - 文章

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SN - 1878-5352

VL - 13

SP - 3344

EP - 3350

JO - Arabian Journal of Chemistry

JF - Arabian Journal of Chemistry

IS - 1

ER -

Bandgap engineering of TiO₂ nanoparticles through MeV Cu ions irradiation

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Keywords

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