单晶碳化锆纳米线的稳定场发射

Stable Field Emission from Single-Crystalline Zirconium Carbide Nanowires.

作者信息

Wu Yimeng, Tang Jie, Tang Shuai, Chen You-Hu, Chiu Ta-Wei, Takeguchi Masaki, Qin Lu-Chang

机构信息

Research Center for Energy and Environmental Materials, National Institute for Materials Science, Tsukuba 305-0047, Ibaraki, Japan.

Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba 305-8577, Ibaraki, Japan.

出版信息

Nanomaterials (Basel). 2024 Sep 27;14(19):1567. doi: 10.3390/nano14191567.

DOI:10.3390/nano14191567

PMID:39404294

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11477592/

Abstract

The <100> oriented single-crystalline Zirconium Carbide (ZrC) nanowires were controllably synthesized on a graphite substrate by chemical vapor deposition (CVD) with optimized growth parameters involving Zirconium tetrachloride (ZrCl), flow of methane (CH), and growth temperature. The length of nanowires is above 10 µm while the diameter is smaller than 100 nm. A single ZrC nanowire was picked up and fixed on a tungsten tip for field emission measurement. After surface pretreatments, a sharpened and cleaned ZrC nanowire emitter showed a high emission current density of 1.1 × 10 A m at a low turn-on voltage of 440 V. The field emission is stable for 150 min with a fluctuation of 1.77%. This work provides an effective method for synthesizing and stabilizing single-crystalline ZrC nanowire emitters as an electron source for electron-beam applications.

摘要

通过化学气相沉积（CVD），利用涉及四氯化锆（ZrCl）、甲烷（CH）流量和生长温度的优化生长参数，在石墨衬底上可控地合成了<100>取向的碳化锆（ZrC）单晶纳米线。纳米线长度超过10 µm，而直径小于100 nm。拾取一根ZrC纳米线并固定在钨尖上进行场发射测量。经过表面预处理后，一根经过锐化和清洁的ZrC纳米线发射器在440 V的低开启电压下显示出1.1×10 A m的高发射电流密度。场发射在150分钟内保持稳定，波动为1.77%。这项工作为合成和稳定单晶ZrC纳米线发射器提供了一种有效方法，作为电子束应用的电子源。