A Phase Sensitive Measurement Technique for Boosted Response Speed of Graphene Fet Gas Sensor

This work presents a new class of gas sensing scheme: the phase sensitive signal on the GFET (Graphene Field Effect Transistor) gas sensors aiming to boost the response speed. Compared with the state-of-art gas sensing reports on measurements of DC resistance changes which are limited by trap states, three distinctive advancements have been achieved on graphene FETs in responses to water vapor: (1) experimental validations of a faster saturation and recovery speed, (2) in-situ measurements of field effect mobility µ and DC carrier concentration NGFET, and (3) multiple charge transfer processes through the plot of NGFET versus µ-1. As such, the proposed sensing scheme and results could open up a new frontier for graphene FET-based gas sensor with fast sensing speed in practical usages.

[1]  K. Nemade,et al.  Role of defects concentration on optical and carbon dioxide gas sensing properties of Sb2O3/graphene composites , 2014 .

[2]  R. Betts,et al.  Changes in Atmospheric Constituents and in Radiative Forcing. Chapter 2 , 2007 .

[3]  K. Novoselov,et al.  Detection of individual gas molecules adsorbed on graphene. , 2006, Nature materials.

[4]  S. Sarma,et al.  A self-consistent theory for graphene transport , 2007, Proceedings of the National Academy of Sciences.

[5]  Jeong-O Lee,et al.  Recovery improvement of graphene-based gas sensors functionalized with nanoscale heterojunctions , 2012 .

[6]  Pablo A. Denis,et al.  Comparative Study of Defect Reactivity in Graphene , 2013 .

[7]  E. Williams,et al.  Charged Impurity Scattering in Graphene , 2007, 0708.2408.

[8]  Cinzia Casiraghi,et al.  Probing the nature of defects in graphene by Raman spectroscopy. , 2012, Nano letters.

[9]  Y. D. Kim,et al.  The role of external defects in chemical sensing of graphene field-effect transistors. , 2013, Nano letters.

[10]  Y. Liu,et al.  A versatile gas sensor with selectivity using a single graphene transistor , 2015, 2015 Transducers - 2015 18th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS).

[11]  F. Kang,et al.  Ultrasensitive gas detection of large-area boron-doped graphene , 2015, Proceedings of the National Academy of Sciences.

[12]  Jason J. Davis,et al.  Elucidating capacitance and resistance terms in confined electroactive molecular layers. , 2013, Analytical chemistry.

[13]  Jinlan Wang,et al.  Defect Healing of Chemical Vapor Deposition Graphene Growth by Metal Substrate Step , 2013 .

[14]  Kenneth L. Shepard,et al.  Graphene Field-Effect Transistors Based on Boron–Nitride Dielectrics , 2013, Proceedings of the IEEE.

[15]  Richard Martel,et al.  Probing charge transfer at surfaces using graphene transistors. , 2011, Nano letters.