Recently synthesized two-dimensional
hydrogen boride (HB) with
a hexagonal boron network offers excellent opportunities for nanoscale
electronic device applications. Herein, we have proposed a type of
field-effect transistor (FET) nanodevice based on a two-dimensional
HB sheet for individual identification of amino acids. Using first-principles
consistent-exchange van der Waals density-functional (vdW-DF-cx) calculations,
we have studied the effects produced by the adsorption of each amino
acid on the electronic properties of the HB-based nanodevice for its
detection. The adsorption energies, adsorption heights, and the charge
transfer of each amino acid can be deliberated as demonstrative of
all 10 amino acids: alanine (Ala), arginine (Arg), aspartic (Asp),
glutamic acid (Glu), glycine (Gly), histidine (His), lysine (Lys),
phenylalanine (Phe), proline (Pro), and tyrosine (Tyr). Furthermore,
the electronic transport properties of the HB nanodevice and HB +
amino acid setup are studied by the nonequilibrium Green’s
function (NEGF) formalism combined with the density functional theory
(DFT) approach. Our results show that the adsorption of each amino
acid on the HB nanodevice gives Fano resonance in the electronic transmission
function. The sensitivity analysis and current–voltage (I–V) characteristic results indicate
that selective detection of amino acids is possible. Thus, we believe
that the HB-based device may be promising for the prospect of protein
sequencing.