Secondary electron emission and photoemission studies on surface films of carbon nitride

Ripalda, J. M.; Montero, I.; Vázquez, Luís; Raboso, D.; Galán, L.

doi:10.1063/1.2173307

Cited by 18 publications

(6 citation statements)

References 14 publications

(17 reference statements)

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“…Therefore, we assign P1 to be sp 2 ‐like, P3 to be sp 3 ‐like and P2 to be associated with the bond‐type associated with the nature of the primary contamination. Amorphous hydrogenated Carbon (a‐CH) is cited to have a higher SE yield than HOPG, due to its diamond‐like sp 3 bonding and hydrogen content and their respective low work functions . This is explained by the formation of an energy band gap and surface states that help the secondary electrons to diffuse and tunnel through the surface energy barrier.…”

Section: Resultsmentioning

confidence: 99%

Making Sense of Complex Carbon and Metal/Carbon Systems by Secondary Electron Hyperspectral Imaging

et al. 2019

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Carbon and carbon/metal systems with a multitude of functionalities are ubiquitous in new technologies but understanding on the nanoscale remains elusive due to their affinity for interaction with their environment and limitations in available characterization techniques. This paper introduces a spectroscopic technique and demonstrates its capacity to reveal chemical variations of carbon. The effectiveness of this approach is validated experimentally through spatially averaging spectroscopic techniques and using Monte Carlo modeling. Characteristic spectra shapes and peak positions for varying contributions of sp2‐like or sp3‐like bond types and amorphous hydrogenated carbon are reported under circumstances which might be observed on highly oriented pyrolytic graphite (HOPG) surfaces as a result of air or electron beam exposure. The spectral features identified above are then used to identify the different forms of carbon present within the metallic films deposited from reactive organometallic inks. While spectra for metals is obtained in dedicated surface science instrumentation, the complex relations between carbon and metal species is only revealed by secondary electron (SE) spectroscopy and SE hyperspectral imaging obtained in a state‐of‐the‐art scanning electron microscope (SEM). This work reveals the inhomogeneous incorporation of carbon on the nanoscale but also uncovers a link between local orientation of metallic components and carbon form.

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Section: Resultsmentioning

confidence: 99%

Making Sense of Complex Carbon and Metal/Carbon Systems by Secondary Electron Hyperspectral Imaging

et al. 2019

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“…Therefore, several approaches are carried out to prevent multipacting by reducing the secondary electron yield (SEY). Researchers have focused on thin coatings with a reliable low SEY such as carbon nitride 4 amorphous carbon layers 5 and titanium nitride 6 . The beneficial effect is usually attributed to the lower SEY of sp 2 carbon with respect to other hybridization states.…”

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confidence: 99%

Fabrication of Porous Ag/TiO2/Au Coatings with Excellent Multipactor Suppression

Bao

et al. 2017

Sci Rep

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Porous Ag/TiO2/Au coatings with excellent multipactor suppression were prepared by fabrication of porous Ag surface through two-step wet chemical etching, synthesis of TiO2 coatings by electroless-plating-like solution deposition and deposition of Au coatings via electroless plating. Porous structure of Ag surface, TiO2 coatings on porous Ag surface and Au coatings on porous Ag/TiO2 surface were verified by field-emission scanning electron microscopy, the composition and crystal type of TiO2 coatings was characterized by X-ray photoelectron spectroscopy and X-ray diffraction. Secondary electron yield (SEY) measurement was used to monitor the SEY coefficient of the porous Ag coatings and Ag/TiO2/Au coatings. The as-obtained porous Ag coatings were proved exhibiting low SEY below 1.2, and the process was highly reproducible. In addition, the porous Ag/TiO2/Au coatings showed excellent multipactor suppression with the SEY 1.23 and good environmental stability. It is worth mentioning that the whole preparation process is simple and feasible, which would provide a promising application in RF devices.

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“…From several earlier studies, carbon and carbon nitrides are known to have a low SEY [1,12,13,14] and the formation of a layer of carbon is generally believed to be the responsible for the conditioning effect occurring in accelerators [15,16]. In this work, carbon coatings have been produced by dc magnetron sputtering (MS) and Plasma Enhanced Chemical Vapor Deposition (PECVD).…”

Section: Introductionmentioning

confidence: 99%

Carbon coatings with low secondary electron yield

Pinto

Calatroni

Neupert

et al. 2013

Vacuum

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Secondary electron emission and photoemission studies on surface films of carbon nitride

Cited by 18 publications

References 14 publications

Making Sense of Complex Carbon and Metal/Carbon Systems by Secondary Electron Hyperspectral Imaging

Making Sense of Complex Carbon and Metal/Carbon Systems by Secondary Electron Hyperspectral Imaging

Fabrication of Porous Ag/TiO2/Au Coatings with Excellent Multipactor Suppression

Carbon coatings with low secondary electron yield

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