Room-Temperature Synthesis of Soluble Carbon Nanotubes by the Sonication of Graphene Oxide Nanosheets

Abstract: The transformation of two-dimensional graphene oxide (GO) nanosheets into carbon nanotubes
was achieved by sonicating GO in 70% nitric acid. Through the use of mass spectrometry to track the
evolution of molecular fragments during the acid ultrasonication, it was observed that GO can be readily

Research Fellow (Postdoctoral Fellow)

Postdoctoral fellow positions for researches in novel carbon nanotube based devices and electrochemical sensor for explosives detection are available in Center for Advanced Bionanosystems, School of Chemistry and Biomedical Engineering, Nanyang Technological University, Singapore. Candidates with extensive research experience on carbon nanotubes, electrochemistry, sensors or electronics are encouraged to apply for the positions.

图1. Schematic illustration of the creation of microfeatures on GO nanosheets with an optical microscope-focused laser beam.

Title: Atomic layer graphene as saturable absorber for ultrafast pulsed lasers

The optical conductance of monolayer graphene is defined solely by the fine structure constant, α = e2/hc (where e is the electron charge, h is Dirac’s constant and c is the speed of light). The absorbance has been predicted to be independent of frequency. In principle, the interband optical absorption in zero-gap graphene could be saturated readily under strong excitation due to Pauli blocking. Here, we demonstrate the use of atomic layer graphene as saturable absorber in a mode-locked fiber laser for the generation of ultrashort soliton pulses (756 fs) at the telecommunication band. The modulation depth can be tuned in a wide range from 66.5% to 6.2% by varying the thickness of graphene. Our results suggest that ultrathin graphene films are potentially useful as optical ele

2009

[39] Kian Ping Loh, Qiaoliang Bao, Priscilla Kailian Ang, Jiaxiang Yang. Invited review on graphene, feature article in Journal of Materials Chemistry, accepted.

[38] Qiaoliang Bao, Han Zhang, Jia-xiang Yang, Shuai Wang, Ding Yuan Tang, Rajan Jose, Seeram Ramakrishna, Chwee Teck Lim, and Kian Ping Loh*. Advanced Functional Materials, accepted.

[37] Shuai Wang, Lena Ai ling Tang, Qiaoliang Bao, Ming Lin, Suzi Deng, Bee Min Goh, and Kian Ping Loh. Room-Temperature Synthesis of Soluble Carbon Nanotubes by the Sonication of Graphene Oxide Nanosheets. (JACS, ja905968v, ASAP)