Preparation and Characterization of Single-Atom Tips

Kuo, Hong Shi; Hwang, Ing−Shouh; Fu, Tsu Yi; Wu, Jhao Ying; Chang, Cheng Fu; Tsong, Tien T.

doi:10.1021/nl048569b

Cited by 129 publications

(115 citation statements)

References 33 publications

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“…Now we have developed a new method for simultaneously preparing a clean W tip surface and the deposition of a noble metal film in an electrochemical cell [12]. This tip can be stored in the ambient condition for a long time.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Single-Atom Tips and Their Field Emission Behaviors

Kuo

Hwang

et al. 2006

e-J. Surf. Sci. Nanotechnol.

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We have developed a simple and reliable method for preparing single-atom tips. Electrochemical techniques are applied to deposit a noble metal film on the W < 111 > tip. With the protection of the metal film, the tip can be stored and transferred in the ambient condition. After a gentle annealing of the plated tip in vacuum, a thermally and chemically stable nano-pyramid with single atom sharpness can be generated at the tip apex. The atomic structure of the tip is imaged by a field ion microscope (FIM) layer by layer through field evaporation. The corresponding field emission patterns can also be determined by the field emission microscopy (FEM). Most importantly, the single atom sharpness as well as the pyramidal structure can be regenerated for tens of times in vacuum simply by annealing if the apex is accidentally damaged. Field emission measurements indicate that the single-atom tips can emit stable electron beams of high brightness with a small extension angle. These desirable features make the single-atom tips very promising for future applications.

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Section: Introductionmentioning

confidence: 99%

Preparation of Single-Atom Tips and Their Field Emission Behaviors

Kuo

Hwang

et al. 2006

e-J. Surf. Sci. Nanotechnol.

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“…Single-atom electron sources (SAESs) [1,2] emit electrons from the terminal atom of a nanopyramid-shaped tip. SAESs have characteristics superior to those of conventional electron sources, including high brightness and high coherence, and are expected to become the preferred stable electron source in future electron optical systems.…”

Section: Introductionmentioning

confidence: 99%

Development of a High-Precision Power Supply and Current Measuring Device for Field Emission Spectroscopy

Kumagai

Murata

Asai

et al. 2016

e-J. Surf. Sci. Nanotech.

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Considerable attention is currently being given to nanotip electron sources. These have a number of desirable emission characteristics, including high current density at low voltage, a small source size leading to high coherency, and narrow confinement of the electron beam. To date, we have developed a high-precision energy analyzer capable of obtaining the emission spectrum of the electrons emitted from a nanotip electron source. To improve the resolution of the analyzer, we design an optimum energy analyzer electrode and a more stable power supply. Moreover, the beam current measurement circuit is needed to facilitate the adjustment of the optical axis. Therefore, we have also developed a computer-controlled power supply with low noise, low ripple, and stable output voltage, together with a current measurement circuit and its associated software.

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“…Noblemetal-covered W nanopyramids with three sides of the {211} faces are supposed to be one of the most potential candidates for such electron sources [1,2]. Since they possess self-repairing and demountable functions [3], longlife and stable operation is certainly expected for practical application.…”

Section: Introductionmentioning

confidence: 99%

Field Ion Microscopy of Nanometer-Size Pyramid Grown on a Blunt End of Tungsten Tip

Nakagawa

Rokuta

Murata

et al. 2012

e-J. Surf. Sci. Nanotechnol.

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We fabricated nanometer-size pyramids with three {211} -facet sides (nanopyramids) on blunt W tip and observed their atomic structures by field ion microscopy (FIM). The blunt W tip was preliminary subjected to remolding treatment in order to sharpen its end. Owing to the atomic resolution of FIM, we found that the {211} and {110} planes faceted markedly as a result of the remolding treatment and clearly detected the neighboring {211} and {110} planes were separated by a monoatomic chain along the ⟨111⟩ direction. In addition, the (111) plane was raised and narrowed owing to the faceting of the three surrounding {211} planes. Dimension of the narrowed (111) plane was about 3 nm. By using the surface of the remolded-tip end as a substrate, we grew the nanopyramid by depositing Pd atoms and elevating the sample temperature to 1000 K. The FIM observation indicated typical signs for the nanopyramid growth such as markedly-faceted {211} planes, monoatomic linear chains for the pyramid ridge, and extremely narrow top of the pyramid. In this study, the top was the third layer of the ideal nanopyramid counting from the top. Along with previous field emission data [E. Rokuta, T. Nakagawa, H. Murata, S. Fujita, H. Shimoyama, and C. Oshima, Jpn. J. Appl. Phys. 50, 115001 (2011).], the remolding treatment was proven to be useful for the nanopyramid growth on the blunt end of the W tip.

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Preparation and Characterization of Single-Atom Tips

Cited by 129 publications

References 33 publications

Preparation of Single-Atom Tips and Their Field Emission Behaviors

Preparation of Single-Atom Tips and Their Field Emission Behaviors

Development of a High-Precision Power Supply and Current Measuring Device for Field Emission Spectroscopy

Field Ion Microscopy of Nanometer-Size Pyramid Grown on a Blunt End of Tungsten Tip

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