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Preparation of GNRs. We dispersed 1 mg of MWCNTsin 10 ml of 1% Tween 20 aqueous solution by sonication for 5 min and then centrifugation at 16,400g for 10 min to remove aggregates. The MWCNT suspension was deposited onto a Si substrate pretreated with 3-aminopropyltriethoxysilane (APTES, 12 ml in 20 ml ofH2O), rinsed with water and then blow-dried. The sample was then calcined at 350 uC for 10 min to remove the Tween 20. A PMMA solution (relative molecular mass, Mw5495,000; 5% in anisole) was spin-coated on MWCNTs on the substrate at 3,000 rounds per minute for 1 min and then baked at 170 uC for 2 h on a hot plate. ThePMMA¨CMWCNT film was peeled off in 1MKOHsolution at 80 uC (ref. 21). Then the film was rinsed with water and printed onto a Si substrate. To make the film well-adhered to the Si substrate, we heated the sample at 80 uC for 10 min in an oven. Ten-watt Ar plasma was used to etch the PMMA¨CMWCNT film at the base pressure of 40 mTorr. After etching, we lifted thePMMAfilm using water and then adhered it to an APTES-treated, 500-nm SiO2/Si substrate with a prefabricated Pt/W marker array. After the PMMA had been removed using acetone vapour21, the obtained sample was calcined at 300 uC for 10 min to remove the residue of PMMA
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