Graphene, 2D atomic layer structure, shows unique electronic band structure makes it attractive for many applications. Its high carrier mobility, high electrical and thermal conductivity make it an exciting material. However, its applicability cannot be effectively realized unless facile techniques to synthesize high quality, large area graphene are developed in a cost effective way. Here, I will discuss the quantum Hall effect (QHE) measured at 12 T at 4.2 ºK on uniform and continuous single layer graphene films grown from different origin/substrates, band gap engineering in 2D atomic hybridized h-BN and C (graphene) domains. Some applications of graphene/ functionalized graphene such as fabrication for urea biosensor; Nitrogen-doped graphene for Lithium Battery Application etc. will be also discussed briefly.

However, Graphene possess many exceptional electronic, optical and mechanical properties, but it is a zero band gap material (semi-metallic). The zero band gap nature of Graphene limits its applicability in the semiconducting field requiring high on-off ratio. And this limitation of Graphene could be overcome by 2D TMDs such as: MoS2, WS2 etc. These materials when thinned down to single atomic layer, shows direct band behavior having band gap in optically visible range. However scalability of these materials is required for any practical applications. Here, I will be also discussing the AP-CVD growth of MoS2 and WS2 2D crystals. 

References:

1.Novel liquid precursor based facile synthesis of large-area continuous, single and few layer graphene films, Anchal Srivastava, Charudatta Galande, Lijie Ci, Li Song, Chaitra Rai, Deep Jariwala, Kevin F. Kelly, Pulickel M. Ajayan, Chemistry of materials 2010 (ACS Journal)- DOI: 10.1021/cm101027c

2.Atomic layers of hybridized boron nitride and graphene domain L. Ci, L. Song, C. H. Jin, D. Jariwala, D. X. Wu, Y. J. Li, A. Srivastava, Z. F. Wang, K. Storr, L. Balicas, F. Liu and P. M. Ajayan Nature Materials, 9, 430-435 (2010)

3.Carbon Nanotube Filters; Anchal Srivastava, O N Srivastava, S Talapatra, R Vajtai and  P M Ajayan; Nature Materials 3, 2004, 610-614.

4.Synthesis Of Nitrogen-Doped Graphene Films For Lithium Battery Application; Arava Leela Mohana Reddy, Anchal Srivastava, Sanketh R. Gowda, Hemtej Gullapalli, Madan Dubey, Pulickel M. Ajayan ACS Nano, 2010, 4 (11), 6337–6342 

5.Functionalized Multilayered Graphene Platform for Urea Sensor, Rajesh K. Srivastava, Saurabh Srivastava, Tharangattu N. Narayanan, Bansi D. Mahlotra, Robert Vajtai, Pulickel M. Ajayan, and Anchal Srivastava, ACS Nano, 6,168-175, 2012 

Graphene, 2D atomic layer structure, shows unique electronic band structure makes it attractive for many applications. Its high carrier mobility, high electrical and thermal conductivity make it an exciting material. However, its applicability cannot be effectively realized unless facile techniques to synthesize high quality, large area graphene are developed in a cost effective way. Here, I will discuss the quantum Hall effect (QHE) measured at 12 T at 4.2 ºK on uniform and continuous single layer graphene films grown from different origin/substrates, band gap engineering in 2D atomic hybridized h-BN and C (graphene) domains. Some applications of graphene/ functionalized graphene such as fabrication for urea biosensor; Nitrogen-doped graphene for Lithium Battery Application etc. will be also discussed briefly.

However, Graphene possess many exceptional electronic, optical and mechanical properties, but it is a zero band gap material (semi-metallic). The zero band gap nature of Graphene limits its applicability in the semiconducting field requiring high on-off ratio. And this limitation of Graphene could be overcome by 2D TMDs such as: MoS2, WS2 etc. These materials when thinned down to single atomic layer, shows direct band behavior having band gap in optically visible range. However scalability of these materials is required for any practical applications. Here, I will be also discussing the AP-CVD growth of MoS2 and WS2 2D crystals. 

References:

1.Novel liquid precursor based facile synthesis of large-area continuous, single and few layer graphene films, Anchal Srivastava, Charudatta Galande, Lijie Ci, Li Song, Chaitra Rai, Deep Jariwala, Kevin F. Kelly, Pulickel M. Ajayan, Chemistry of materials 2010 (ACS Journal)- DOI: 10.1021/cm101027c

2.Atomic layers of hybridized boron nitride and graphene domain L. Ci, L. Song, C. H. Jin, D. Jariwala, D. X. Wu, Y. J. Li, A. Srivastava, Z. F. Wang, K. Storr, L. Balicas, F. Liu and P. M. Ajayan Nature Materials, 9, 430-435 (2010)

3.Carbon Nanotube Filters; Anchal Srivastava, O N Srivastava, S Talapatra, R Vajtai and  P M Ajayan; Nature Materials 3, 2004, 610-614.

4.Synthesis Of Nitrogen-Doped Graphene Films For Lithium Battery Application; Arava Leela Mohana Reddy, Anchal Srivastava, Sanketh R. Gowda, Hemtej Gullapalli, Madan Dubey, Pulickel M. Ajayan ACS Nano, 2010, 4 (11), 6337–6342 

5.Functionalized Multilayered Graphene Platform for Urea Sensor, Rajesh K. Srivastava, Saurabh Srivastava, Tharangattu N. Narayanan, Bansi D. Mahlotra, Robert Vajtai, Pulickel M. Ajayan, and Anchal Srivastava, ACS Nano, 6,168-175, 2012