Stable contrast mode on TiO2(110) surface with metal-coated tips using AFM

Li, Yan Jun; Wen, Hao; Zhang, Quanzhen; Adachi, Yuuki; Arima, Eiji; Kinoshita, Yukinori; Nomura, Hiroyasu; Ma, Zhanfang; Kou, Lili; Tsukuda, Yoshihiro; Naitoh, Yoshitaka; Sugawara, Yasuhiro; Xu, Rui; Cheng, Zhihai

doi:10.1016/j.ultramic.2018.04.003

Cited by 14 publications

(17 citation statements)

References 29 publications

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“…The cantilever deflection was measured by an optical beam deflection method . All images were obtained in the neutral mode, which yields the images most resembling the true geometric structure …”

Section: Methodsmentioning

confidence: 99%

“…The tip was cleaned by Ar + sputtering (1 keV, 5 × 10 –7 Torr, 5 min) to remove the contaminants and the native oxide layer. It is pointed that the stable neutral mode is achieved using metal-coated Si cantilever …”

Section: Methodsmentioning

confidence: 99%

“…The cantilever deflection was measured by an optical beam deflection method. 51 All images were obtained in the neutral mode, 52 which yields the images most resembling the true geometric structure. 27 KPFM was operated in the frequency-modulation mode, 53 in which the topography and surface potential were measured simultaneously.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…It is pointed that the stable neutral mode is achieved using metal-coated Si cantilever. 52 A clean rutile TiO 2 (110) surface (provided by Furuuchi Chemical Corporation) was prepared by several cycles of Ar + sputtering (1 keV, ■ RESULTS AND DISCUSSION Adsorption Structure of OH t . The AFM image of OH t at 0 V is shown in Figure 2a.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Charge Behavior of Terminal Hydroxyl on Rutile TiO₂(110)

Miyazaki

Sugawara

2021

Langmuir

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Titanium dioxide (TiO2) is of considerable interest as a photocatalyst and a catalyst support. Surface hydroxyl groups (OH) are the most common adsorbates on the TiO2 surface and are believed to play crucial roles in their applications. Although the characteristics of bridging hydroxyl (OHbr) have been well understood, the adsorption structure and charged states of terminal hydroxyl (OHt) have not yet been experimentally elucidated at an atomic scale. In this study, we have investigated an isolated OHt on the rutile TiO2(110) surface by atomic force microscopy (AFM) and Kelvin probe force microscopy (KPFM). We found that OHt is in a negatively charged state. The unique characteristic of OHt is different from that of OHbr and involves the amphoterism and diversity of catalytic reactions of TiO2.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Charge Behavior of Terminal Hydroxyl on Rutile TiO₂(110)

Miyazaki

Sugawara

2021

Langmuir

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“…The cantilever tip was first degassed at approximately 650 K for 30 min and then cleaned by Ar ion bombardment to remove the contaminants, prior to the measurements. Features of the surface structure were related to the charge states of the tip apex, and a stable tip was essential to accurately characterize the surface structure and properties in the experiment [ 25 , 26 ]. The imaging mode became stable in AFM experiments when the metal-coated Si cantilever was employed in the experiments [ 27 , 28 , 29 ].…”

Section: Methodsmentioning

confidence: 99%

Multi-Channel Exploration of O Adatom on TiO2(110) Surface by Scanning Probe Microscopy

Wen

Sugawara

2020

Nanomaterials

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We studied the O2 dissociated state under the different O2 exposed temperatures with atomic resolution by scanning probe microscopy (SPM) and imaged the O adatom by simultaneous atomic force microscopy (AFM)/scanning tunneling microscopy (STM). The effect of AFM operation mode on O adatom contrast was investigated, and the interaction of O adatom and the subsurface defect was observed by AFM/STM. Multi-channel exploration was performed to investigate the charge transfer between the adsorbed O and the TiO2(110) by obtaining the frequency shift, tunneling current and local contact potential difference at an atomic scale. The tunneling current image showed the difference of the tunneling possibility on the single O adatom and paired O adatoms, and the local contact potential difference distribution of the O-TiO2(110) surface institutively revealed the charge transfer from TiO2(110) surface to O adatom. The experimental results are expected to be helpful in investigating surface/interface properties by SPM.

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