Alterations in ambipolar characteristic of graphene due to adsorption ofEscherichia colibacteria

Abstract

In order to evaluate the interaction between biomaterials and graphene from the perspective of its ambipolar characteristic, we have investigated the alteration in ambipolarity of graphenebased field effect transistors (G-FET) after the adsorption of Escherichia coli (E. coli) bacteria onto its graphene layer. We confirmed a positive shift in the ambipolar curve of the G-FETs after the adsorption of E. coli, presumably due to the negative charge of the adsorbed E. coli. However, we did not observe any decrease in the electron mobility or conductivity of the G-FETs, which implied that E. coli did not chemically react with the carbon atoms of graphene, nor introduce any damage on the graphene lattice, but were only physically adsorbed onto the graphene surface. These findings may extend the prominence of graphene as a stable yet sensitive material to be fully utilized in future biosensing applications. These results were then compared to those of ferritin adsorption, which is a protein shell and biomaterial like E. coli, and radical oxygen doping onto the graphene surface.

Pelatihan Komunikasi Asertif Bagi Kader ASI Hebat Jejaring Kesehatan Purwokerto Utara

“…Jika konflik terjadi, para pihak yang berkonflik mencari solusi bersama yang saling memuaskan kedua belah pihak. (Mulyana & Rahmat, 2018). Tentunya hal-hal tersebut di atas perlu digali lebih dalam dan tentunya kader harus mampu menemukan faktor lain yang mungkin menjadi salah satu sebab permasalahan menyusui.…”