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用于医学成像中开放式X射线源的金属基底上碳纳米管场发射体的直接合成

Direct Synthesis of Carbon Nanotube Field Emitters on Metal Substrate for Open-Type X-ray Source in Medical Imaging.

作者信息

Gupta Amar Prasad, Park Sangjun, Yeo Seung Jun, Jung Jaeik, Cho Chonggil, Paik Sang Hyun, Park Hunkuk, Cho Young Chul, Kim Seung Hoon, Shin Ji Hoon, Ahn Jeung Sun, Ryu Jehwang

机构信息

Department of Physics, Kyung Hee University, Seoul 02453, Korea.

CAT Beam Tech Co., Ltd., Seoul Biohub, 117-3, Hoegi-ro, Dongdaemun-gu, Seoul 02455, Korea.

出版信息

Materials (Basel). 2017 Jul 29;10(8):878. doi: 10.3390/ma10080878.

DOI:10.3390/ma10080878
PMID:28773237
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5578244/
Abstract

We report the design, fabrication and characterization of a carbon nanotube enabled open-type X-ray system for medical imaging. We directly grew the carbon nanotubes used as electron emitter for electron gun on a non-polished raw metallic rectangular-rounded substrate with an area of 0.1377 cm² through a plasma enhanced chemical vapor deposition system. The stable field emission properties with triode electrodes after electrical aging treatment showed an anode emission current of 0.63 mA at a gate field of 7.51 V/μm. The 4.5-inch cubic shape open type X-ray system was developed consisting of an X-ray aperture, a vacuum part, an anode high voltage part, and a field emission electron gun including three electrodes with focusing, gate and cathode electrodes. Using this system, we obtained high-resolution X-ray images accelerated at 42-70 kV voltage by digital switching control between emitter and ground electrode.

摘要

我们报告了一种用于医学成像的基于碳纳米管的开放式X射线系统的设计、制造和特性。我们通过等离子体增强化学气相沉积系统，在面积为0.1377平方厘米的未抛光原始金属矩形圆角基板上，直接生长用作电子枪电子发射体的碳纳米管。经过电老化处理后，三极电极具有稳定的场发射特性，在7.51 V/μm的栅极场下，阳极发射电流为0.63 mA。开发了一个4.5英寸立方体形开放式X射线系统，它由一个X射线孔径、一个真空部分、一个阳极高压部分和一个场发射电子枪组成，该电子枪包括聚焦电极、栅极和阴极三个电极。使用该系统，通过发射极和接地电极之间的数字开关控制，我们在42 - 70 kV电压下获得了高分辨率X射线图像。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf3/5578244/2bca32c7a67d/materials-10-00878-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf3/5578244/992ca2133990/materials-10-00878-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf3/5578244/398dbfb58b98/materials-10-00878-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf3/5578244/2ab317a60bcb/materials-10-00878-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf3/5578244/acdeaa84e7bd/materials-10-00878-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf3/5578244/186dcf36a698/materials-10-00878-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf3/5578244/0e396d3c8f97/materials-10-00878-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf3/5578244/2bca32c7a67d/materials-10-00878-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf3/5578244/992ca2133990/materials-10-00878-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf3/5578244/398dbfb58b98/materials-10-00878-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf3/5578244/2ab317a60bcb/materials-10-00878-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf3/5578244/acdeaa84e7bd/materials-10-00878-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf3/5578244/186dcf36a698/materials-10-00878-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf3/5578244/0e396d3c8f97/materials-10-00878-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf3/5578244/2bca32c7a67d/materials-10-00878-g007.jpg

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J Nanosci Nanotechnol. 2013 Oct;13(10):7100-3. doi: 10.1166/jnn.2013.7866.
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A vacuum-sealed compact x-ray tube based on focused carbon nanotube field-emission electrons.
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Large Scale Synthesis of Nanopyramidal-Like VO₂ Films by an Oxygen-Assisted Etching Growth Method with Significantly Enhanced Field Emission Properties.通过氧辅助蚀刻生长法大规模合成具有显著增强场发射特性的纳米金字塔状VO₂薄膜。
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