Two-dimensional crystals have emerged as a class of materials that may impact future electronic technologies. Experimentally identifying and characterizing new functional two-dimensional materials is challenging, but also potentially rewarding. Here, we fabricate field-effect transistors based on few-layer black phosphorus crystals with thickness down to a few nanometres. Reliable transistor performance is achieved at room temperature in samples thinner than 7.5 nm, with drain current modulation on the order of 10(5) and well-developed current saturation in the I-V characteristics. The charge-carrier mobility is found to be thickness-dependent, with the highest values up to ∼ 1,000 cm(2) V(-1) s(-1) obtained for a thickness of ∼ 10 nm. Our results demonstrate the potential of black phosphorus thin crystals as a new two-dimensional material for applications in nanoelectronic devices.

http://absimage.aps.org/image/MAR14/MWS_MAR14-2013-005031.pdf

Black Phosphorus Field-effect Transistors

Recent Advances in Adsorption Kinetic Models: Their Application to Dye Types

The recent advancement of low-dimensional nanostructured materials for drug delivery and drug sensing application: A brief review

This study presents a novel approach for exploring the sensitivity and selectivity of cyclic oligofuran (5/6/7CF) toward gaseous analytes and their comparison with straight chain analogues (5/6/7SF). The work is not only vital to understand the superior sensitivity but also for rational design of new sensors based on cyclic ring structures of oligofuran. Interaction of cyclic and straight chain oligofuran with NH3, CO, CO2, N2H4, HCN, H2O2, H2S, CH4, CH3OH, SO2, SO3 and H2O analytes is studied via DFT calculation at B3LYP-D3/6–31++G (d, p) level of theory. The sensitivity and selectivity are illustrated by the thermodynamic parameters (Ebind, SAPT0 energies, NCI analysis), electronic properties (H-L gap, percentage of average energy gap, CHELPG charge transfer, DOS spectra), and UV–Vis analysis. All these properties are simulated at B3LYP/6-31G (d) level of theory while UV–Vis is calculated at TD-DFT method. Cyclic oligofurans have high binding energies with analytes compared to 5/6/7SF which corresponds to higher sensitivity of 5/6/7CF. Furthermore, the cyclization of oligofuran significantly improves the sensitivity and selectivity of the system. Alteration in electronic properties of 5/6/7CF and 5/6/7SF is remarkably high upon complexation with SO2 and SO3. Further the stability of rings (5, 6 and 7 membered cyclic oligofurans) and their SO3 complexes is also confirmed by molecular dynamics calculations. The findings of the work clearly suggest that the cyclic geometry enhances not only sensitivity but also selectivity of conducting polymers (oligofuran).

Cyclic versus straight chain oligofuran as sensor: A detailed DFT study.

Adsorption behaviour of chronic blistering agents on graphdiyne; excellent correlation among SAPT, reduced density gradient (RDG) and QTAIM analyses

Novel ε-phosphorene nanosheet device for the detection of tear gas molecules – A first-principles research

Kagome phosphorene molecular device for sensing chloropicrin and phosgene – A first-principles study

Boron trifluoride interaction studies on graphdiyne nanotubes – A first-principles insight

Graphdiyne nanosheets as a sensing medium for formaldehyde and formic acid – A first-principles outlook

In this research, two-dimensional material, black-phosphorene nanosheets (Black-PNS) have been deployed as a sensing substrate for detecting two tear gas molecules, namely, benzyl bromide and bromo...

J. Princy Maria

Papers

Novel ε-phosphorene nanosheet device for the detection of tear gas molecules – A first-principles research

Kagome phosphorene molecular device for sensing chloropicrin and phosgene – A first-principles study

Boron trifluoride interaction studies on graphdiyne nanotubes – A first-principles insight

Graphdiyne nanosheets as a sensing medium for formaldehyde and formic acid – A first-principles outlook

Surface adsorption studies of benzyl bromide and bromobenzyl cyanide vapours on black phosphorene nanosheets – a first-principles perception