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Name : Premkumar Thirugnanam Title: Nanosunflowers Dept : Electrical Engineering

Name : Premkumar Thirugnanam Title: Nanosunflowers Dept : Electrical Engineering E-mail: atprem@gmail.com.

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Name : Premkumar Thirugnanam Title: Nanosunflowers Dept : Electrical Engineering

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  1. Name: Premkumar Thirugnanam Title: Nanosunflowers Dept: Electrical Engineering E-mail: atprem@gmail.com • The field-emission scanning electron microscope (FESEM) image shows a GaN sunflowers developed in Prof. Yongfeng Lu’s group. The structures were synthesized by a laser-assisted metal organic chemical vapor deposition (L-MOCVD) using the precursors trimethylgallium (TMGa) and ammonia (NH3). A silicon substrate was heated to 600 ºC using a CO2 laser beam at 20 watt and exposed to the precursor gases for five minutes. The GaN deposition on Si substrate resulted in the formation of nanosunflowers. The average diameter of the sunflower is 800 nm. The image was taken with a Hitachi 4700 FESEM at 18,000× magnification.

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