| dc.contributor.advisor |
Markert , John T . |
|
| dc.contributor.committeeMember |
Yao , Zhen |
|
| dc.contributor.committeeMember |
Shih , Chih -Kang |
|
| dc.contributor.committeeMember |
Niu , Qian |
|
| dc.contributor.committeeMember |
Fernandez , Benito |
|
| dc.creator |
Mancevski , Vladimir |
|
| dc.date.accessioned |
2011 -10 -28T18 :36 :32Z |
|
| dc.date.available |
2011 -10 -28T18 :36 :32Z |
|
| dc.date.created |
2011 -08 |
|
| dc.date.issued |
2011 -10 -28 |
|
| dc.date.submitted |
August 2011 |
|
| dc.identifier.uri |
http : / /hdl .handle .net /2152 /ETD -UT -2011 -08 -3990 |
|
| dc.description.abstract |
We have advanced the state -of -the -art for nano -fabrication of carbon nanotube (CNT ) based field emission devices , and have conducted experimental and theoretical investigations to better understand the reasons for the high reduced brightness achieved . We have demonstrated that once the CNT emitter failure modes are better understood and resolved , such CNT emitters can easily reach reduced brightness on the order of 10⁹ A m⁻² sr⁻¹ V⁻¹ and noise levels of about 1 % . These results are about 10 % better than the best brightness results from a nanotip emitter archived to date . Our CNT emitters have order of magnitude better reduced brightness than state -of -the -art commercial Schottky emitters . Our analytical models of field emission matched our experimental results well . The CNT emitter was utilized in a modified commercial scanning electron microscope (SEM ) and briefly operated to image a sample . We also report a successful emission from a lateral CNT emitter element having a single suspended CNT , where the electron emission is from the CNT sidewall . The lateral CNT emitters have reduced brightness on the order of 10⁸ A m⁻² sr⁻¹ V⁻¹ , about 10X less than the vertical CNT emitters we fabricated and analyzed . The characteristics of the lateral field emitter were analyzed for manually fabricated and directly grown CNT emitters . There was no significant difference in performance based on the way the CNT emitter was fabricated . We showed that the fabrication technique for making a single CNT emitter element can be scaled to an array of elements , with potential density of 10⁶ -10⁷ CNT emitters per cm² . We also report a new localized , site selective technique for editing carbon nanotubes using water vapor and a focused electron beam . We have demonstrated the use of this technique to cut CNTs to length with 10s of nanometers precision and to etch selected areas from CNTs with 10s of nanometers precision . The use of this technique was demonstrated by editing a lateral CNT emitter . We have conducted investigations to demonstrate the effects of higher local water pressure on the CNT etching efficiency . This was achieved by developing a new method of localized gas delivery with a nano -manipulator . |
|
| dc.format.mimetype |
application /pdf |
|
| dc.language.iso |
eng |
|
| dc.subject |
Carbon nanotube |
|
| dc.subject |
CNT |
|
| dc.subject |
Field emission |
|
| dc.subject |
Scanning electron microscope |
|
| dc.subject |
High brightness |
|
| dc.subject |
Lateral CNT emitter |
|
| dc.subject |
Sidewall emission |
|
| dc.subject |
Carbon nanotube editing |
|
| dc.subject |
CNT etching |
|
| dc.subject |
EBIE |
|
| dc.subject |
EBID |
|
| dc.title |
Fabrication and analysis of carbon nanotube based emitters |
|
| dc.description.department |
Physics |
|
| dc.type.genre |
thesis |
* |
| dc.type.material |
text |
* |
| thesis.degree.name |
Doctor of Philosophy |
|
| thesis.degree.level |
Doctoral |
|
| thesis.degree.discipline |
Physics |
|
| thesis.degree.grantor |
University of Texas at Austin |
|
| thesis.degree.department |
Physics |
|
| dc.date.updated |
2011 -10 -28T18 :36 :56Z |
|
| dc.identifier.slug |
2152 /ETD -UT -2011 -08 -3990 |
|