Ferroelectricity in Niobium Oxide Dihalides NbOX2 (X = Cl, I): A Macroscopic- to Microscopic-Scale Study

Chaofei Liu; Xiuying Zhang; Xinyun Wang; Ziying Wang; Ibrahim Abdelwahab; Ivan Verzhbitskiy; Yan Shao; Goki Eda; Wanxin Sun; Lei Shen; Kian Ping Loh

doi:10.1021/acsnano.2c09267

Ferroelectricity in Niobium Oxide Dihalides NbOX₂ (X = Cl, I): A Macroscopic- to Microscopic-Scale Study

Chaofei Liu, Xiuying Zhang, Xinyun Wang, Ziying Wang, Ibrahim Abdelwahab, Ivan Verzhbitskiy, Yan Shao, Goki Eda, Wanxin Sun, Lei Shen, Kian Ping Loh^*

^*此作品的通讯作者

科研成果: 期刊稿件 › 文章 › 同行评审

16 引用（Scopus）

摘要

2D materials with ferroelectric and piezoelectric properties are of interest for energy harvesting, memory storage and electromechanical systems. Here, we present a systematic study of the ferroelectric properties in NbOX₂ (X = Cl, I) across different spatial scales. The in-plane ferroelectricity in NbOX₂ was investigated using transport and piezoresponse force microscopy (PFM) measurements, where it was observed that NbOCl₂ has a stronger ferroelectric order than NbOI₂. A high local field, exerted by both PFM and scanning tunneling microscopy (STM) tips, was found to induce 1D collinear ferroelectric strips in NbOCl₂. STM imaging reveals the unreconstructed atomic structures of NbOX₂ surfaces, and scanning tunneling spectroscopy was used to probe the electronic states induced at defect (vacancy) sites.

源语言	英语
页（从-至）	7170-7179
页数	10
期刊	ACS Nano
卷	17
期	8
DOI	https://doi.org/10.1021/acsnano.2c09267
出版状态	已出版 - 25 4月 2023
已对外发布	是

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10.1021/acsnano.2c09267

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title = "Ferroelectricity in Niobium Oxide Dihalides NbOX2 (X = Cl, I): A Macroscopic- to Microscopic-Scale Study",

abstract = "2D materials with ferroelectric and piezoelectric properties are of interest for energy harvesting, memory storage and electromechanical systems. Here, we present a systematic study of the ferroelectric properties in NbOX2 (X = Cl, I) across different spatial scales. The in-plane ferroelectricity in NbOX2 was investigated using transport and piezoresponse force microscopy (PFM) measurements, where it was observed that NbOCl2 has a stronger ferroelectric order than NbOI2. A high local field, exerted by both PFM and scanning tunneling microscopy (STM) tips, was found to induce 1D collinear ferroelectric strips in NbOCl2. STM imaging reveals the unreconstructed atomic structures of NbOX2 surfaces, and scanning tunneling spectroscopy was used to probe the electronic states induced at defect (vacancy) sites.",

keywords = "1D collinearity, NbOX, defect bound states, ferroelectricity, van der Waals materials",

author = "Chaofei Liu and Xiuying Zhang and Xinyun Wang and Ziying Wang and Ibrahim Abdelwahab and Ivan Verzhbitskiy and Yan Shao and Goki Eda and Wanxin Sun and Lei Shen and Loh, {Kian Ping}",

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T1 - Ferroelectricity in Niobium Oxide Dihalides NbOX2 (X = Cl, I)

T2 - A Macroscopic- to Microscopic-Scale Study

AU - Liu, Chaofei

AU - Zhang, Xiuying

AU - Wang, Xinyun

AU - Wang, Ziying

AU - Abdelwahab, Ibrahim

AU - Verzhbitskiy, Ivan

AU - Shao, Yan

AU - Eda, Goki

AU - Sun, Wanxin

AU - Shen, Lei

AU - Loh, Kian Ping

PY - 2023/4/25

Y1 - 2023/4/25

N2 - 2D materials with ferroelectric and piezoelectric properties are of interest for energy harvesting, memory storage and electromechanical systems. Here, we present a systematic study of the ferroelectric properties in NbOX2 (X = Cl, I) across different spatial scales. The in-plane ferroelectricity in NbOX2 was investigated using transport and piezoresponse force microscopy (PFM) measurements, where it was observed that NbOCl2 has a stronger ferroelectric order than NbOI2. A high local field, exerted by both PFM and scanning tunneling microscopy (STM) tips, was found to induce 1D collinear ferroelectric strips in NbOCl2. STM imaging reveals the unreconstructed atomic structures of NbOX2 surfaces, and scanning tunneling spectroscopy was used to probe the electronic states induced at defect (vacancy) sites.

AB - 2D materials with ferroelectric and piezoelectric properties are of interest for energy harvesting, memory storage and electromechanical systems. Here, we present a systematic study of the ferroelectric properties in NbOX2 (X = Cl, I) across different spatial scales. The in-plane ferroelectricity in NbOX2 was investigated using transport and piezoresponse force microscopy (PFM) measurements, where it was observed that NbOCl2 has a stronger ferroelectric order than NbOI2. A high local field, exerted by both PFM and scanning tunneling microscopy (STM) tips, was found to induce 1D collinear ferroelectric strips in NbOCl2. STM imaging reveals the unreconstructed atomic structures of NbOX2 surfaces, and scanning tunneling spectroscopy was used to probe the electronic states induced at defect (vacancy) sites.

KW - 1D collinearity

KW - NbOX

KW - defect bound states

KW - ferroelectricity

KW - van der Waals materials

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AN - SCOPUS:85152701899

SN - 1936-0851

VL - 17

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JO - ACS Nano

JF - ACS Nano

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ER -

Ferroelectricity in Niobium Oxide Dihalides NbOX2 (X = Cl, I): A Macroscopic- to Microscopic-Scale Study

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Ferroelectricity in Niobium Oxide Dihalides NbOX₂ (X = Cl, I): A Macroscopic- to Microscopic-Scale Study