7 Assembly of nanowies

7 Assembly of nanowies - Assembly of Nanowires Lecture 7...

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Unformatted text preview: Assembly of Nanowires Lecture 7 Jan 29, 2008 - Electrical Field Alignment - Flow Alignment - Langmuir-Blodgett Technique - Blowing Bubble Method - Contact Printing - Rolling Printing Electric-field Directed Alignment Electric-field can polarize the nanowires _ + _ + nanowire Lieber, Nature v409,p 66 (2001). Electric-field Directed Alignment Applied voltage for twice at different pairs of electrodes to make nanowire crosses. Flow Alignment first layer second layer flow PDMS mold substrate parallel array crossed array (a) (b) - Nanowire liquid suspension flow induce shear force to align nanowire along flow direction - Control the NW separation down to 100 nm scale by NW solution density, flow time and surface functionality patterning. Flow Alignment (Lieber, Science v291, p630 (2001)) (c) 500 nm Flow Alignment: - Controlling spacings by surface patterning - Multi-layer flow alignment. (Lieber, Science 291, p630 (2001)) Langmuir-Blodgett Technique - Surfactants are molecules with hydrophobic tail and hydrophilic head. - Surfactants are molecules with hydrophobic tail and hydrophilic head....
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This note was uploaded on 06/05/2010 for the course MATSCI 316 taught by Professor Cui,y during the Winter '08 term at Stanford.

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7 Assembly of nanowies - Assembly of Nanowires Lecture 7...

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