19606133 carbon nano tubes

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Carbo n Na no-t ube s: An Ov er view BY ARUNDUBEY ROLL NO. 0905EC071033 ELEX. & COMM. DPTT. I. T. M., GWALIOR 

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Page 1: 19606133 Carbon Nano Tubes

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Car bo n Na no-t ube s:

An Ov er view

BY ARUNDUBEY

ROLL NO. 0905EC071033ELEX. & COMM. DPTT.I. T. M., GWALIOR 

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Pre senta tion Ove rvie w

• Definition• History

• Properties• Current Application• Manufacturing Techniques

• Future application• References

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Defin itio n: Ca rbonNanotubes

• Single-wall carbon nanotubes are a new form ofcarbon made by rolling up a single graphite sheetto a narrow but long tube closed at both sides byfullerene-like end caps.

• However, their attraction lies not only in thebeauty of their molecular structures: throughintentional alteration of their physical andchemical properties fullerenes exhibit anextremely wide range of interesting andpotentially useful properties.

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SCHEMETIC IEW O! CNT"

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INTRODUCTION

Caron Nanotues! T#$% '()"*(+' 10,000 #)" -#$$) -*$ *-'*$ -*# /+$"#" + +)2 '"-))" + /*(+$ -)4*+$".D#"/+6))2 #$ 1991 (% )")*/-)"* NEC, -)% -*6) -) +)$#* +'") *" #$'"/') #)" + #$ '*

"* ))/+$#/ 2)6#/)". T+ ('#2-+") 2)6#/)", "/#)$#"" '" ()*() + *$#'*) -) N*$+'()" #$* /+$+)2 *%. IBM )")*/-)"'"#$ *$ *+#/ +/) #/+"/+)8A!M, *$ #$"')$ -+") # /*$*% *//'*)% )*"')2 +/)" +

*+" *$2 +)/')", -*6) )/)$%2)6#")2 * )*$" + /-*$#$ *$*$+'():" +"##+$, "-*) *$2+#)$*#+$, *" ) *" /'#$ #

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Importan t H isto ry

• !! "iscovery of multi-wall carbon nanotubes by S. #i$ima• !!% &onductivity of carbon nanotubes

•   '. (. )intmire, *. #. "unlap and &. +. (hite• !! Structural rigidity of carbon nanotubes

•   . verney, (. /hong, and ". +om0nek• !! Synthesis of single-wall nanotubes by S #i$ima and + #chihashi• !!1 Nanotubes as field emitters•   *y 2.. 3in4ler, '.H. Hafner, 5. 6ikolaev, 7. 7ou, S.. 8im, ". +om0nek, 5. 6ordlander,

".+. &olbert, and 3.9. Smalley• !! Hydrogen storage in nanotubes

•   2 & "illon, 8 ) 'ones, + 2 *ekkendahl, & H 8iang, " S *ethune and ) ' Heben• !!; Synthesis of nanotube peapods *.(. Smith, ). )onthioux, and ".9. 7u44i• %<<< +hermal conductivity of nanotubes 

•   Savas *erber, =oung-8yun 8won, and "avid +om0nek• %<< #ntegration of carbon nanotubes for logic circuits•   5.&. &ollins, ).S. 2rnold, and 5. 2vouris• %<< #ntrinsic superconductivity of carbon nanotubes

•   ). 8ociak, 2. =u. 8asumov, S. u>ron, *. 3eulet, #. #. 8hodos, =u. *. orbatov, ?. +.?olkov, 7. ?accarini, and H. *ouchiat

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Pro perties

• )etallic conductivity @e.g. the salts 2&A<@2Balkali metalsCC

• Superconductivity with +cDs of up to [email protected]. the salts 2&A< @2Balkali metalsCC

• Eerromagnetism @in @+"29C&A< - withoutthe presence of d-electronsC

• 6on-linear optical activity• 5olymeri4ation to form a variety of -, %-,

and " polymer structures

•  

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Pro perties (2 )

•   Nanotubes can be either electrically conductiveor semiconductive, depending on their helicity.

• +hese one-dimensional fibers exhibit electricalconductivity as high as copper, thermalconductivity as high as diamond,

• Strength << times greater than steel at onesixth the weight, and high strain to failure.

• &urrent length limits are about one millimeter.•

 

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HOW IT WOR;S<

• Vander Waals forces: A*/#6) +/)"*+$ *+" *$2 +)/')" -+2

 N*$+'()" #% **#$" -) "'*/)" -)%*) */)2 +$. T-) *$2) W**"

#$)*/#+$ ()))$ -) N*$+'()" *$2 -)"'*/)" +$ -#/- -)% )" #" #") "+$)$+'- + /-*$) -)

"-*) + N*$+'()". I$ )$)*, -)% )$2 +*2* + -) "-*) + -) "'*/) +$ -#/- -)%"# (% ()$2#$ *$2 ()/+#$ "#-% "='*"-)2.T-+") /-*$)" /*$ /*'") -) +)#)" +

 N*$+'()" +$ "'*/)" + 2#)+ -+") + ))/ N*$+'()", -#/- *)"*#- *$2 -*6) /#/'* /+"">")/#+$". T-#"*#")" -) +""#(##% + *#+#$. N*$+'()":

 +)#)" (% #$)$#+$*% /-*$#$ -)#"-*)".

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Curre nt A ppi!a tio ns

• &arbon 6ano-tubes are extending our ability tofabricate devices such as:

• )olecular probes• 5ipes• (ires• *earings

• Springs• ears• 5umps

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"anufa!turin#$e!%ni&u es

• 9vaporation of solid carbon in arcdischarge,

• 7aser ablation,

• &atalytic chemical vapor deposition ofcarbon containing gases,

• &atalytic decomposition of fullerenes .

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'utu re Appi! atio ns

• )olecular transistors.

• Eield emitters.

• *uilding blocks for bottom-up electronics.

• Smaller, lighter weight components for next generationspacecraft.

• 9nable large Fuantities of hydrogen to be stored in small lowpressure tanks.

• Space elevator, #nstead of blasting off for the heavensastronauts could reach the #SS as easily as they would a

department store: G6ext floor, 79, watch your step pleaseI

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Nanotube 'un

• =ou can see animations of virtual nanotubes byfollowing these links:

• http:JJwww.photon.t.u-

tokyo.ac.$pJKmaruyamaJnanotube.html• +hen select G2nimation alleryI•  2lso http:JJwww.pa.msu.eduJcmpJcscJsimindex.html•  

• =ou can create your own virtual S(6+ at:• http:JJ$crystal.comJsteffenweberJ'2?2J$nanoJ$nano.html

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