Fabrication of a high-density emitter array for electrospray thrusters using field emitter array process. (24th May 2019)

• Record Type: Journal Article
• Authors: Inoue, Naoki; Nagao, Masayoshi; Murakami, Katsuhisa; Khumpuang, Sommawan; Hara, Shiro; Takao, Yoshinori
• Is Part Of: Japanese journal of applied physics. Volume 58:Number SE(2019)
• Publication Date: 2019-05-24
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/1347-4065/ab0fee
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: To improve the thrust density of electrospray thrusters using ionic liquids as the propellant, we have fabricated a high-density emitter array utilizing the fabrication technique of a field emitter array (FEA) or gated nano electron sources. The density of the emitter array can reach approximately 4 million cm −2, which is four orders of magnitude higher than that of conventional electrospray thrusters. Performing deep reactive ion etching from the back side of the same structure as FEAs and removing their Ni cones by dilute nitric acid, we have successfully fabricated sub- μ m scale capillary emitters with self-aligned extractor electrodes and ionic liquid reservoirs behind them. Current measurements were also conducted with EMI-BF4 and EMI-DCA as the propellant. Although the ion was not extracted with EMI-BF4 owing to its electrochemical reaction with the electrodes, both positive and negative ion currents were detected using EMI-DCA, where the current density exceeded that of conventional electrospray thrusters.