A Core-Shell MWCNT-Pt Nanowire Electron Source with Anomalously Long-Term Stable Field Emission

Wenqi Zhang; Peidong Chao; Donglei Chen; Zhan Yang; Lixin Dong

doi:10.3390/nano13030532

A Core-Shell MWCNT-Pt Nanowire Electron Source with Anomalously Long-Term Stable Field Emission

Wenqi Zhang, Peidong Chao, Donglei Chen, Zhan Yang^*, Lixin Dong^*

^*Corresponding author for this work

Department of Biomedical Engineering

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

2 Citations (Scopus)

38 Downloads (CityUHK Scholars)

Abstract

A hybrid core-shell structured nanowire is proposed for a long-term stable electron source based on an isolated platinum/multi-walled carbon nanotube (Pt/MWCNT). This hybrid nanowire is prepared by growing a Pt shell on a metallic MWCNT through a field-emission-induced deposition (FEID) method. An in situ field emission (FE) platform was constructed inside a scanning electron microscope (SEM) equipped with two nanorobotic manipulators (NRMs) for the preparation and testing of the hybrid nanowire. An in situ fatigue test was conducted with high current intensity (500 nA) to show the influence of the Pt shell. Compared with the pristine bare MWCNT, our hybrid-nanowire-based electron source has a lifetime of hundreds of times longer and can work continuously for up to 48 h under relatively high pressure (3.6 × 10⁻³ Pa) without having an apparent change in its structure or emission currents, demonstrating good stability and tolerance to poor working conditions. The anomalous long-term stability is attributed mainly to the shielding of oxygen by Pt from the carbon shells and less heating due to the work function lowering by Pt. © 2023 by the authors.

Original language	English
Article number	532
Journal	Nanomaterials
Volume	13
Issue number	3
Online published	28 Jan 2023
DOIs	https://doi.org/10.3390/nano13030532
Publication status	Published - Feb 2023

Funding

This work was partially supported by the National Natural Science Foundation of China (grant nos. U1813211 and 62127810) and the General Research Fund of Hong Kong (Project nos. 11219419, 11217221, and 11213720).

Research Keywords

electron source
field emission
focused electron-beam-induced deposition
hybrid nanowire
nanorobotic manipulation

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This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/

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title = "A Core-Shell MWCNT-Pt Nanowire Electron Source with Anomalously Long-Term Stable Field Emission",

abstract = "A hybrid core-shell structured nanowire is proposed for a long-term stable electron source based on an isolated platinum/multi-walled carbon nanotube (Pt/MWCNT). This hybrid nanowire is prepared by growing a Pt shell on a metallic MWCNT through a field-emission-induced deposition (FEID) method. An in situ field emission (FE) platform was constructed inside a scanning electron microscope (SEM) equipped with two nanorobotic manipulators (NRMs) for the preparation and testing of the hybrid nanowire. An in situ fatigue test was conducted with high current intensity (500 nA) to show the influence of the Pt shell. Compared with the pristine bare MWCNT, our hybrid-nanowire-based electron source has a lifetime of hundreds of times longer and can work continuously for up to 48 h under relatively high pressure (3.6 × 10−3 Pa) without having an apparent change in its structure or emission currents, demonstrating good stability and tolerance to poor working conditions. The anomalous long-term stability is attributed mainly to the shielding of oxygen by Pt from the carbon shells and less heating due to the work function lowering by Pt. {\textcopyright} 2023 by the authors.",

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author = "Wenqi Zhang and Peidong Chao and Donglei Chen and Zhan Yang and Lixin Dong",

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month = feb,

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T1 - A Core-Shell MWCNT-Pt Nanowire Electron Source with Anomalously Long-Term Stable Field Emission

AU - Zhang, Wenqi

AU - Chao, Peidong

AU - Chen, Donglei

AU - Yang, Zhan

AU - Dong, Lixin

PY - 2023/2

Y1 - 2023/2

N2 - A hybrid core-shell structured nanowire is proposed for a long-term stable electron source based on an isolated platinum/multi-walled carbon nanotube (Pt/MWCNT). This hybrid nanowire is prepared by growing a Pt shell on a metallic MWCNT through a field-emission-induced deposition (FEID) method. An in situ field emission (FE) platform was constructed inside a scanning electron microscope (SEM) equipped with two nanorobotic manipulators (NRMs) for the preparation and testing of the hybrid nanowire. An in situ fatigue test was conducted with high current intensity (500 nA) to show the influence of the Pt shell. Compared with the pristine bare MWCNT, our hybrid-nanowire-based electron source has a lifetime of hundreds of times longer and can work continuously for up to 48 h under relatively high pressure (3.6 × 10−3 Pa) without having an apparent change in its structure or emission currents, demonstrating good stability and tolerance to poor working conditions. The anomalous long-term stability is attributed mainly to the shielding of oxygen by Pt from the carbon shells and less heating due to the work function lowering by Pt. © 2023 by the authors.

AB - A hybrid core-shell structured nanowire is proposed for a long-term stable electron source based on an isolated platinum/multi-walled carbon nanotube (Pt/MWCNT). This hybrid nanowire is prepared by growing a Pt shell on a metallic MWCNT through a field-emission-induced deposition (FEID) method. An in situ field emission (FE) platform was constructed inside a scanning electron microscope (SEM) equipped with two nanorobotic manipulators (NRMs) for the preparation and testing of the hybrid nanowire. An in situ fatigue test was conducted with high current intensity (500 nA) to show the influence of the Pt shell. Compared with the pristine bare MWCNT, our hybrid-nanowire-based electron source has a lifetime of hundreds of times longer and can work continuously for up to 48 h under relatively high pressure (3.6 × 10−3 Pa) without having an apparent change in its structure or emission currents, demonstrating good stability and tolerance to poor working conditions. The anomalous long-term stability is attributed mainly to the shielding of oxygen by Pt from the carbon shells and less heating due to the work function lowering by Pt. © 2023 by the authors.

KW - electron source

KW - field emission

KW - focused electron-beam-induced deposition

KW - hybrid nanowire

KW - nanorobotic manipulation

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JF - Nanomaterials

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ER -

A Core-Shell MWCNT-Pt Nanowire Electron Source with Anomalously Long-Term Stable Field Emission

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GRF: Nanorobotic Manipulation Inside a TEM for In-situ Nanodevice Prototyping and Characterization

GRF: Plasmonic Nanosensors and Antennas for Signal Transduction and Energy Harvesting for Biomedical Microrobots

GRF: Memoristic Ambient Oxygen Nanosensors for Medical Microrobotic Agents

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A Core-Shell MWCNT-Pt Nanowire Electron Source with Anomalously Long-Term Stable Field Emission

Abstract

Funding

Research Keywords

Publisher's Copyright Statement

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Projects

GRF: Nanorobotic Manipulation Inside a TEM for In-situ Nanodevice Prototyping and Characterization

GRF: Plasmonic Nanosensors and Antennas for Signal Transduction and Energy Harvesting for Biomedical Microrobots

GRF: Memoristic Ambient Oxygen Nanosensors for Medical Microrobotic Agents

Cite this