旋涂法制备石墨烯光阴极与测试分析

李世龙; 焦岗成

旋涂法制备石墨烯光阴极与测试分析

李世龙^{1, 2,},
焦岗成^{1, 2}

1.
微光夜视技术重点实验室, 陕西西安 710065
2.
昆明物理研究所, 云南昆明 650223

详细信息

作者简介:
李世龙（1985-），男，高级工程师，主要从事微光夜视技术研究。E-mail：shilonglee@163.com

中图分类号: O47
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- 文章访问数: 29
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出版历程
- 收稿日期: 2023-10-18
- 修回日期: 2024-01-18
- 刊出日期: 2024-12-19

Prepared Test and Analysis of Graphene Photocathode by the Spin Coating Method

LI Shilong^{1, 2,},
JIAO Gangcheng^{1, 2}

1.
Science and Technology on Low-Light-Level Night Vision Laboratory, Xi'an 710065, China
2.
Kunming Institute of Physics, Kunming 650223, China

摘要

摘要:
为研究石墨烯光阴极的特性，在Hummer方法的基础上引入超声和热水的辅助手段，制备得到石墨烯粉末，以此作为前驱体在阴极窗口玻璃基底上旋涂形成石墨烯薄膜，再使用电子束蒸镀工艺，以镍铬作为蒸镀材料制成环形电极，形成石墨烯光阴极组件。通过原子力显微镜、分光光度计、四探针、光荧光测试仪等技术手段对不同制备和处理工艺的石墨烯光阴极组件进行了研究分析。结果表明：增加分散液浓度和后续高温还原处理均使得石墨烯光阴极组件的吸收率增加；高温还原处理不仅可以提升石墨烯光阴极组件表面平整度，而且不会破坏石墨烯光阴极的晶体结构，还可以有效减少石墨烯光阴极的缺陷，对提高石墨烯光阴极发射特性具有一定促进作用。
- 石墨烯 /
- 光电阴极 /
- 旋涂 /
- 高温还原处理
Abstract:
In this study, the properties of graphene photocathodes were investigated using a modified Hummers' method enhanced by ultrasonic and hot water treatments to synthesize graphene powder. This powder, serving as a precursor, was used to form graphene films on the glass substrates of the photocathode window via spin coating. Subsequently, annular Ni/Cr electrodes were fabricated by electron-beam evaporation, resulting in the assembly of the graphene photocathode. Comprehensive analyses of photocathodes subjected to various preparation and processing techniques were conducted using atomic force microscopy, spectrophotometry, four-point probing, and photoluminescence testing. The results indicate that both the increased dispersion concentration and subsequent temperature reduction treatments significantly enhanced the absorption rate of the photocathode. Importantly, high-temperature reduction not only improves the surface smoothness of the photocathode assembly but also maintains the integrity of its crystal structure, reducing defects. This contributes positively to enhancing the emission characteristics of the graphene photocathode.
- graphene /
- photocathode /
- spin coating /
- reduction roasting

HTML全文

图 1 石墨烯薄膜样品：(a)-(e) 5种典型结构的样品；(f) 前驱体的拉曼光谱测试图；(g) 前驱体的TEM图

Figure 1. The graphene thin films. (a)-(e): Five typical structures samples; (f): The Raman spectra of the precursors; (g): The TEM image of the precursors

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图 2 a、b、c样品AFM图像

Figure 2. The AFM images of sample a、b and c

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图 3 a、b、c样品透过率测试曲线

Figure 3. The transmission curve of sample a, b and c

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图 4 a、b、c样品光荧光测试曲线

Figure 4. The fluorescence intensity curves of sample a, b and c

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表 1 样品旋涂工艺及后处理方法

Table 1 The spin coating technology and after-treatment method

Sample number	Concentration of dispersion/(g/ml)	Coating speed/rpm	After-treatment method
a	0.4	6000	-
b	0.8	6000	-
c	0.4	6000	Heat treatment at 500℃ for 2 hours in hydrogen atmo-sphere
d	0.4	6000	-
e	0.4	6000	Heat treatment at 500℃ for 2 hours in hydrogen atmosphere

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表 2 a, b, c样品表面电阻测试结果

Table 2 The surface resistance of a, b and c sample Ω/□

Sample number	Test1	Test2	Test3	Test4	Test5	Average value
a	1825	1783	1865	1653	1921	1809.4
b	1504	1483	1395	1482	1655	1503.8
c	954	875	935	1008	861	926.6

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