A review of surface functionalisation of diamond for thermionic emission applications
نویسندگان
چکیده
Surface functionalisation of diamond can produce negative electron affinity (NEA), where the conduction band lies higher in energy than vacuum level. Hydrogen termination is well-known to NEA on but be removed by temperatures above ∼700 °C, making it unsuitable for diamond-based thermionic applications, high are converted into electricity via an emission process. In this review article we give overview emission, describe potential applications converters, then different surface schemes that provide a with NEA. We discuss relative merits surfaces have been developed both computationally and experimentally as alternative cathode materials devices.
منابع مشابه
Thermionic emission from surface-terminated nanocrystalline diamond
Thermionic electron emission forms the basis of both electron sources for a variety of applications and a direct energy conversion process that is compact and scalable. The present study characterizes thermionic emission from boron-doped nanocrystalline diamond films with hydrogen and nitrophenyl surface termination layers. A hemispherical energy analyzer was used to measure electron energy dis...
متن کاملBeta Radiation Enhanced Thermionic Emission from Diamond Thin Films
Diamond-based thermionic emission devices could provide a means to produce clean and renewable energy through direct heat-to-electrical energy conversion. Hindering progress of the technology are the thermionic output current and threshold temperature of the emitter cathode. In this report, we study the effects on thermionic emission caused by in situ exposure of the diamond cathode to beta rad...
متن کاملThermionic Emission from Diamond Films in Molecular Hydrogen Environments
Diamond-based low-work function thermionic electron emitters are in high demand for applications ranging from electron guns and space thrusters to electrical energy converters. A key requirement of such diamond-based electron sources is hydrogen termination of the surfaces which can significantly reduce the emission barrier. However, at high temperatures (≤600°C), terminated hydrogen begins to ...
متن کاملinvestigating the feasibility of a proposed model for geometric design of deployable arch structures
deployable scissor type structures are composed of the so-called scissor-like elements (sles), which are connected to each other at an intermediate point through a pivotal connection and allow them to be folded into a compact bundle for storage or transport. several sles are connected to each other in order to form units with regular polygonal plan views. the sides and radii of the polygons are...
ذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Carbon
سال: 2021
ISSN: ['0008-6223', '1873-3891']
DOI: https://doi.org/10.1016/j.carbon.2020.09.019