Study of Thermal-Field Emission Properties and Investigation of Temperature dependent Noise in the Emission Current form vertical Carbon nanotube emitters

Handle URI:
http://hdl.handle.net/10754/623648
Title:
Study of Thermal-Field Emission Properties and Investigation of Temperature dependent Noise in the Emission Current form vertical Carbon nanotube emitters
Authors:
Kolekar, Sadhu; Patole, Shashikant P. ( 0000-0001-6669-6635 ) ; Patil, Sumati; Yoo, J.B.; Dharmadhikari, C.V.
Abstract:
We have investigated temperature dependent field electron emission characteristics of vertical carbon nanotubes (CNTs). The generalized expression for electron emission from well defined cathode surface is given by Millikan and Lauritsen [1] for the combination of temperature and electric field effect. The same expression has been used to explain the electron emission characteristics from vertical CNT emitters. Furthermore, this has been applied to explain the electron emission for different temperatures ranging from room temperature to 1500 K. The real-time field electron emission images at room temperature and 1500 K are recorded by using Charge Coupled Device (CCD), in order to understand the effect of temperature on electron emission spots in image morphology (as indicated by ring like structures) and electron emission spot intensity of the emitters. Moreover, the field electron emission images can be used to calculate the total number of emitters per cm2 for electron emission. The calculated number of emitters per cm2 is 4.5x107 and, the actual number emitters per cm2 present for electron emission calculated from Atomic Force Microscopy (AFM) data is 1.2x1012. The measured Current-Voltage (I-V) characteristics obey the Folwer-Nordheim (F-N) type behavior. The fluctuations in the emission current are recorded at different temperatures and, temperature dependence of power spectral density obeys power law relation s(f)=I2/f2 with that of emission current and frequency.
KAUST Department:
Materials Science and Engineering Program
Citation:
Kolekar S, Patole SP, Patil S, Yoo JB, Dharmadhikari CV (2017) Study of Thermal-Field Emission Properties and Investigation of Temperature dependent Noise in the Emission Current form vertical Carbon nanotube emitters. Surface Science. Available: http://dx.doi.org/10.1016/j.susc.2017.05.002.
Publisher:
Elsevier BV
Journal:
Surface Science
Issue Date:
5-May-2017
DOI:
10.1016/j.susc.2017.05.002
Type:
Article
ISSN:
0039-6028
Sponsors:
SK acknowledges UGC, Govt. of India and CSIR, Govt. of India for Research Fellowships.
Additional Links:
http://www.sciencedirect.com/science/article/pii/S003960281630797X
Appears in Collections:
Articles; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorKolekar, Sadhuen
dc.contributor.authorPatole, Shashikant P.en
dc.contributor.authorPatil, Sumatien
dc.contributor.authorYoo, J.B.en
dc.contributor.authorDharmadhikari, C.V.en
dc.date.accessioned2017-05-17T07:41:40Z-
dc.date.available2017-05-17T07:41:40Z-
dc.date.issued2017-05-05en
dc.identifier.citationKolekar S, Patole SP, Patil S, Yoo JB, Dharmadhikari CV (2017) Study of Thermal-Field Emission Properties and Investigation of Temperature dependent Noise in the Emission Current form vertical Carbon nanotube emitters. Surface Science. Available: http://dx.doi.org/10.1016/j.susc.2017.05.002.en
dc.identifier.issn0039-6028en
dc.identifier.doi10.1016/j.susc.2017.05.002en
dc.identifier.urihttp://hdl.handle.net/10754/623648-
dc.description.abstractWe have investigated temperature dependent field electron emission characteristics of vertical carbon nanotubes (CNTs). The generalized expression for electron emission from well defined cathode surface is given by Millikan and Lauritsen [1] for the combination of temperature and electric field effect. The same expression has been used to explain the electron emission characteristics from vertical CNT emitters. Furthermore, this has been applied to explain the electron emission for different temperatures ranging from room temperature to 1500 K. The real-time field electron emission images at room temperature and 1500 K are recorded by using Charge Coupled Device (CCD), in order to understand the effect of temperature on electron emission spots in image morphology (as indicated by ring like structures) and electron emission spot intensity of the emitters. Moreover, the field electron emission images can be used to calculate the total number of emitters per cm2 for electron emission. The calculated number of emitters per cm2 is 4.5x107 and, the actual number emitters per cm2 present for electron emission calculated from Atomic Force Microscopy (AFM) data is 1.2x1012. The measured Current-Voltage (I-V) characteristics obey the Folwer-Nordheim (F-N) type behavior. The fluctuations in the emission current are recorded at different temperatures and, temperature dependence of power spectral density obeys power law relation s(f)=I2/f2 with that of emission current and frequency.en
dc.description.sponsorshipSK acknowledges UGC, Govt. of India and CSIR, Govt. of India for Research Fellowships.en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S003960281630797Xen
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Surface Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Surface Science, [, , (2017-05-05)] DOI: 10.1016/j.susc.2017.05.002 . © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectVertical Carbon nanotubesen
dc.subjectThermal-field emissionen
dc.subjectNoise in emission current etcen
dc.titleStudy of Thermal-Field Emission Properties and Investigation of Temperature dependent Noise in the Emission Current form vertical Carbon nanotube emittersen
dc.typeArticleen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.identifier.journalSurface Scienceen
dc.eprint.versionPost-printen
dc.contributor.institutionDepartment of Physics, Savitribai Phule Pune University, Pune 411007, Indiaen
dc.contributor.institutionCatalysis Division, CSIR- National Chemical Laboratory, Pune 411008, Indiaen
dc.contributor.institutionDepartment of Physics, University of South Florida, Tampa, Florida, USA 33620-995.en
dc.contributor.institutionSchool of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 440 746, Koreaen
dc.contributor.institutionIndian Institute of Science, Bangalore- 560012, India.en
dc.contributor.institutionIndian Institute of Science, Education & Research, Pashan, Pune-411008, India.en
kaust.authorPatole, Shashikant P.en
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