Excellent Field Emission Properties of Short Conical Carbon Nanotubes Prepared by Microwave Plasma Enhanced CVD Process

Abstract Randomly oriented short and low density conical carbon nanotubes (CNTs) were prepared on Si substrates by tubular microwave plasma enhanced chemical vapor deposition process at relatively low temperature (350–550 °C) by judiciously controlling the microwave power and growth time in $ C_{2}...
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Gespeichert in:

Autor*in:	Srivastava, SanjayKumar [verfasserIn] Vankar, Vasant D Kumar, Vikram

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2007

Schlagwörter:	Carbon nanotubes CVD Microwave plasma CVD Field emission Conical CNTs

Anmerkung:	© to the authors 2007

Übergeordnetes Werk:	Enthalten in: Nanoscale research letters - New York, NY [u.a.] : Springer, 2006, 3(2007), 1 vom: 05. Dez.
Übergeordnetes Werk:	volume:3 ; year:2007 ; number:1 ; day:05 ; month:12

Links:	Volltext

DOI / URN:	10.1007/s11671-007-9109-x

Katalog-ID:	SPR021707529

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520			\|a Abstract Randomly oriented short and low density conical carbon nanotubes (CNTs) were prepared on Si substrates by tubular microwave plasma enhanced chemical vapor deposition process at relatively low temperature (350–550 °C) by judiciously controlling the microwave power and growth time in $ C_{2} %$ H_{2} $ + $ NH_{3} $gas composition and Fe catalyst. Both length as well as density of the CNTs increased with increasing microwave power. CNTs consisted of regular conical compartments stacked in such a way that their outer diameter remained constant. Majority of the nanotubes had a sharp conical tip (5–20 nm) while its other side was either open or had a cone/pear-shaped catalyst particle. The CNTs were highly crystalline and had many open edges on the outer surface, particularly near the joints of the two compartments. These films showed excellent field emission characteristics. The best emission was observed for a medium density film with the lowest turn-on and threshold fields of 1.0 and 2.10 V/μm, respectively. It is suggested that not only CNT tip but open edges on the body also act as active emission sites in the randomly oriented geometry of such periodic structures.
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allfields	10.1007/s11671-007-9109-x doi (DE-627)SPR021707529 (SPR)s11671-007-9109-x-e DE-627 ger DE-627 rakwb eng Srivastava, SanjayKumar verfasserin aut Excellent Field Emission Properties of Short Conical Carbon Nanotubes Prepared by Microwave Plasma Enhanced CVD Process 2007 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © to the authors 2007 Abstract Randomly oriented short and low density conical carbon nanotubes (CNTs) were prepared on Si substrates by tubular microwave plasma enhanced chemical vapor deposition process at relatively low temperature (350–550 °C) by judiciously controlling the microwave power and growth time in $ C_{2} %$ H_{2} $ + $ NH_{3} $gas composition and Fe catalyst. Both length as well as density of the CNTs increased with increasing microwave power. CNTs consisted of regular conical compartments stacked in such a way that their outer diameter remained constant. Majority of the nanotubes had a sharp conical tip (5–20 nm) while its other side was either open or had a cone/pear-shaped catalyst particle. The CNTs were highly crystalline and had many open edges on the outer surface, particularly near the joints of the two compartments. These films showed excellent field emission characteristics. The best emission was observed for a medium density film with the lowest turn-on and threshold fields of 1.0 and 2.10 V/μm, respectively. It is suggested that not only CNT tip but open edges on the body also act as active emission sites in the randomly oriented geometry of such periodic structures. Carbon nanotubes (dpeaa)DE-He213 CVD (dpeaa)DE-He213 Microwave plasma CVD (dpeaa)DE-He213 Field emission (dpeaa)DE-He213 Conical CNTs (dpeaa)DE-He213 Vankar, Vasant D aut Kumar, Vikram aut Enthalten in Nanoscale research letters New York, NY [u.a.] : Springer, 2006 3(2007), 1 vom: 05. Dez. (DE-627)518632474 (DE-600)2253244-4 1556-276X nnns volume:3 year:2007 number:1 day:05 month:12 https://dx.doi.org/10.1007/s11671-007-9109-x kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 3 2007 1 05 12
spelling	10.1007/s11671-007-9109-x doi (DE-627)SPR021707529 (SPR)s11671-007-9109-x-e DE-627 ger DE-627 rakwb eng Srivastava, SanjayKumar verfasserin aut Excellent Field Emission Properties of Short Conical Carbon Nanotubes Prepared by Microwave Plasma Enhanced CVD Process 2007 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © to the authors 2007 Abstract Randomly oriented short and low density conical carbon nanotubes (CNTs) were prepared on Si substrates by tubular microwave plasma enhanced chemical vapor deposition process at relatively low temperature (350–550 °C) by judiciously controlling the microwave power and growth time in $ C_{2} %$ H_{2} $ + $ NH_{3} $gas composition and Fe catalyst. Both length as well as density of the CNTs increased with increasing microwave power. CNTs consisted of regular conical compartments stacked in such a way that their outer diameter remained constant. Majority of the nanotubes had a sharp conical tip (5–20 nm) while its other side was either open or had a cone/pear-shaped catalyst particle. The CNTs were highly crystalline and had many open edges on the outer surface, particularly near the joints of the two compartments. These films showed excellent field emission characteristics. The best emission was observed for a medium density film with the lowest turn-on and threshold fields of 1.0 and 2.10 V/μm, respectively. It is suggested that not only CNT tip but open edges on the body also act as active emission sites in the randomly oriented geometry of such periodic structures. Carbon nanotubes (dpeaa)DE-He213 CVD (dpeaa)DE-He213 Microwave plasma CVD (dpeaa)DE-He213 Field emission (dpeaa)DE-He213 Conical CNTs (dpeaa)DE-He213 Vankar, Vasant D aut Kumar, Vikram aut Enthalten in Nanoscale research letters New York, NY [u.a.] : Springer, 2006 3(2007), 1 vom: 05. Dez. (DE-627)518632474 (DE-600)2253244-4 1556-276X nnns volume:3 year:2007 number:1 day:05 month:12 https://dx.doi.org/10.1007/s11671-007-9109-x kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 3 2007 1 05 12
allfields_unstemmed	10.1007/s11671-007-9109-x doi (DE-627)SPR021707529 (SPR)s11671-007-9109-x-e DE-627 ger DE-627 rakwb eng Srivastava, SanjayKumar verfasserin aut Excellent Field Emission Properties of Short Conical Carbon Nanotubes Prepared by Microwave Plasma Enhanced CVD Process 2007 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © to the authors 2007 Abstract Randomly oriented short and low density conical carbon nanotubes (CNTs) were prepared on Si substrates by tubular microwave plasma enhanced chemical vapor deposition process at relatively low temperature (350–550 °C) by judiciously controlling the microwave power and growth time in $ C_{2} %$ H_{2} $ + $ NH_{3} $gas composition and Fe catalyst. Both length as well as density of the CNTs increased with increasing microwave power. CNTs consisted of regular conical compartments stacked in such a way that their outer diameter remained constant. Majority of the nanotubes had a sharp conical tip (5–20 nm) while its other side was either open or had a cone/pear-shaped catalyst particle. The CNTs were highly crystalline and had many open edges on the outer surface, particularly near the joints of the two compartments. These films showed excellent field emission characteristics. The best emission was observed for a medium density film with the lowest turn-on and threshold fields of 1.0 and 2.10 V/μm, respectively. It is suggested that not only CNT tip but open edges on the body also act as active emission sites in the randomly oriented geometry of such periodic structures. Carbon nanotubes (dpeaa)DE-He213 CVD (dpeaa)DE-He213 Microwave plasma CVD (dpeaa)DE-He213 Field emission (dpeaa)DE-He213 Conical CNTs (dpeaa)DE-He213 Vankar, Vasant D aut Kumar, Vikram aut Enthalten in Nanoscale research letters New York, NY [u.a.] : Springer, 2006 3(2007), 1 vom: 05. Dez. (DE-627)518632474 (DE-600)2253244-4 1556-276X nnns volume:3 year:2007 number:1 day:05 month:12 https://dx.doi.org/10.1007/s11671-007-9109-x kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 3 2007 1 05 12
allfieldsGer	10.1007/s11671-007-9109-x doi (DE-627)SPR021707529 (SPR)s11671-007-9109-x-e DE-627 ger DE-627 rakwb eng Srivastava, SanjayKumar verfasserin aut Excellent Field Emission Properties of Short Conical Carbon Nanotubes Prepared by Microwave Plasma Enhanced CVD Process 2007 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © to the authors 2007 Abstract Randomly oriented short and low density conical carbon nanotubes (CNTs) were prepared on Si substrates by tubular microwave plasma enhanced chemical vapor deposition process at relatively low temperature (350–550 °C) by judiciously controlling the microwave power and growth time in $ C_{2} %$ H_{2} $ + $ NH_{3} $gas composition and Fe catalyst. Both length as well as density of the CNTs increased with increasing microwave power. CNTs consisted of regular conical compartments stacked in such a way that their outer diameter remained constant. Majority of the nanotubes had a sharp conical tip (5–20 nm) while its other side was either open or had a cone/pear-shaped catalyst particle. The CNTs were highly crystalline and had many open edges on the outer surface, particularly near the joints of the two compartments. These films showed excellent field emission characteristics. The best emission was observed for a medium density film with the lowest turn-on and threshold fields of 1.0 and 2.10 V/μm, respectively. It is suggested that not only CNT tip but open edges on the body also act as active emission sites in the randomly oriented geometry of such periodic structures. Carbon nanotubes (dpeaa)DE-He213 CVD (dpeaa)DE-He213 Microwave plasma CVD (dpeaa)DE-He213 Field emission (dpeaa)DE-He213 Conical CNTs (dpeaa)DE-He213 Vankar, Vasant D aut Kumar, Vikram aut Enthalten in Nanoscale research letters New York, NY [u.a.] : Springer, 2006 3(2007), 1 vom: 05. Dez. (DE-627)518632474 (DE-600)2253244-4 1556-276X nnns volume:3 year:2007 number:1 day:05 month:12 https://dx.doi.org/10.1007/s11671-007-9109-x kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 3 2007 1 05 12
allfieldsSound	10.1007/s11671-007-9109-x doi (DE-627)SPR021707529 (SPR)s11671-007-9109-x-e DE-627 ger DE-627 rakwb eng Srivastava, SanjayKumar verfasserin aut Excellent Field Emission Properties of Short Conical Carbon Nanotubes Prepared by Microwave Plasma Enhanced CVD Process 2007 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © to the authors 2007 Abstract Randomly oriented short and low density conical carbon nanotubes (CNTs) were prepared on Si substrates by tubular microwave plasma enhanced chemical vapor deposition process at relatively low temperature (350–550 °C) by judiciously controlling the microwave power and growth time in $ C_{2} %$ H_{2} $ + $ NH_{3} $gas composition and Fe catalyst. Both length as well as density of the CNTs increased with increasing microwave power. CNTs consisted of regular conical compartments stacked in such a way that their outer diameter remained constant. Majority of the nanotubes had a sharp conical tip (5–20 nm) while its other side was either open or had a cone/pear-shaped catalyst particle. The CNTs were highly crystalline and had many open edges on the outer surface, particularly near the joints of the two compartments. These films showed excellent field emission characteristics. The best emission was observed for a medium density film with the lowest turn-on and threshold fields of 1.0 and 2.10 V/μm, respectively. It is suggested that not only CNT tip but open edges on the body also act as active emission sites in the randomly oriented geometry of such periodic structures. Carbon nanotubes (dpeaa)DE-He213 CVD (dpeaa)DE-He213 Microwave plasma CVD (dpeaa)DE-He213 Field emission (dpeaa)DE-He213 Conical CNTs (dpeaa)DE-He213 Vankar, Vasant D aut Kumar, Vikram aut Enthalten in Nanoscale research letters New York, NY [u.a.] : Springer, 2006 3(2007), 1 vom: 05. Dez. (DE-627)518632474 (DE-600)2253244-4 1556-276X nnns volume:3 year:2007 number:1 day:05 month:12 https://dx.doi.org/10.1007/s11671-007-9109-x kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 3 2007 1 05 12
language	English
source	Enthalten in Nanoscale research letters 3(2007), 1 vom: 05. Dez. volume:3 year:2007 number:1 day:05 month:12
sourceStr	Enthalten in Nanoscale research letters 3(2007), 1 vom: 05. Dez. volume:3 year:2007 number:1 day:05 month:12
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	Carbon nanotubes CVD Microwave plasma CVD Field emission Conical CNTs
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container_title	Nanoscale research letters
authorswithroles_txt_mv	Srivastava, SanjayKumar @@aut@@ Vankar, Vasant D @@aut@@ Kumar, Vikram @@aut@@
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author	Srivastava, SanjayKumar
spellingShingle	Srivastava, SanjayKumar misc Carbon nanotubes misc CVD misc Microwave plasma CVD misc Field emission misc Conical CNTs Excellent Field Emission Properties of Short Conical Carbon Nanotubes Prepared by Microwave Plasma Enhanced CVD Process
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topic_title	Excellent Field Emission Properties of Short Conical Carbon Nanotubes Prepared by Microwave Plasma Enhanced CVD Process Carbon nanotubes (dpeaa)DE-He213 CVD (dpeaa)DE-He213 Microwave plasma CVD (dpeaa)DE-He213 Field emission (dpeaa)DE-He213 Conical CNTs (dpeaa)DE-He213
topic	misc Carbon nanotubes misc CVD misc Microwave plasma CVD misc Field emission misc Conical CNTs
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title	Excellent Field Emission Properties of Short Conical Carbon Nanotubes Prepared by Microwave Plasma Enhanced CVD Process
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title_full	Excellent Field Emission Properties of Short Conical Carbon Nanotubes Prepared by Microwave Plasma Enhanced CVD Process
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author_browse	Srivastava, SanjayKumar Vankar, Vasant D Kumar, Vikram
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title_sort	excellent field emission properties of short conical carbon nanotubes prepared by microwave plasma enhanced cvd process
title_auth	Excellent Field Emission Properties of Short Conical Carbon Nanotubes Prepared by Microwave Plasma Enhanced CVD Process
abstract	Abstract Randomly oriented short and low density conical carbon nanotubes (CNTs) were prepared on Si substrates by tubular microwave plasma enhanced chemical vapor deposition process at relatively low temperature (350–550 °C) by judiciously controlling the microwave power and growth time in $ C_{2} %$ H_{2} $ + $ NH_{3} $gas composition and Fe catalyst. Both length as well as density of the CNTs increased with increasing microwave power. CNTs consisted of regular conical compartments stacked in such a way that their outer diameter remained constant. Majority of the nanotubes had a sharp conical tip (5–20 nm) while its other side was either open or had a cone/pear-shaped catalyst particle. The CNTs were highly crystalline and had many open edges on the outer surface, particularly near the joints of the two compartments. These films showed excellent field emission characteristics. The best emission was observed for a medium density film with the lowest turn-on and threshold fields of 1.0 and 2.10 V/μm, respectively. It is suggested that not only CNT tip but open edges on the body also act as active emission sites in the randomly oriented geometry of such periodic structures. © to the authors 2007
abstractGer	Abstract Randomly oriented short and low density conical carbon nanotubes (CNTs) were prepared on Si substrates by tubular microwave plasma enhanced chemical vapor deposition process at relatively low temperature (350–550 °C) by judiciously controlling the microwave power and growth time in $ C_{2} %$ H_{2} $ + $ NH_{3} $gas composition and Fe catalyst. Both length as well as density of the CNTs increased with increasing microwave power. CNTs consisted of regular conical compartments stacked in such a way that their outer diameter remained constant. Majority of the nanotubes had a sharp conical tip (5–20 nm) while its other side was either open or had a cone/pear-shaped catalyst particle. The CNTs were highly crystalline and had many open edges on the outer surface, particularly near the joints of the two compartments. These films showed excellent field emission characteristics. The best emission was observed for a medium density film with the lowest turn-on and threshold fields of 1.0 and 2.10 V/μm, respectively. It is suggested that not only CNT tip but open edges on the body also act as active emission sites in the randomly oriented geometry of such periodic structures. © to the authors 2007
abstract_unstemmed	Abstract Randomly oriented short and low density conical carbon nanotubes (CNTs) were prepared on Si substrates by tubular microwave plasma enhanced chemical vapor deposition process at relatively low temperature (350–550 °C) by judiciously controlling the microwave power and growth time in $ C_{2} %$ H_{2} $ + $ NH_{3} $gas composition and Fe catalyst. Both length as well as density of the CNTs increased with increasing microwave power. CNTs consisted of regular conical compartments stacked in such a way that their outer diameter remained constant. Majority of the nanotubes had a sharp conical tip (5–20 nm) while its other side was either open or had a cone/pear-shaped catalyst particle. The CNTs were highly crystalline and had many open edges on the outer surface, particularly near the joints of the two compartments. These films showed excellent field emission characteristics. The best emission was observed for a medium density film with the lowest turn-on and threshold fields of 1.0 and 2.10 V/μm, respectively. It is suggested that not only CNT tip but open edges on the body also act as active emission sites in the randomly oriented geometry of such periodic structures. © to the authors 2007
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title_short	Excellent Field Emission Properties of Short Conical Carbon Nanotubes Prepared by Microwave Plasma Enhanced CVD Process
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Excellent Field Emission Properties of Short Conical Carbon Nanotubes Prepared by Microwave Plasma Enhanced CVD Process

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