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Volumn 132, Issue 48, 2010, Pages 17149-17156

Influence of electrolyte composition on liquid-gated carbon nanotube and graphene transistors

Author keywords

[No Author keywords available]

Indexed keywords

AQUEOUS ELECTROLYTE; BIOLOGICAL SAMPLES; CARBON SURFACE; CELL EXTRACTS; DIFFERENT MECHANISMS; ELECTROLYTE COMPOSITIONS; GATE CAPACITANCE; GRAPHENE TRANSISTORS; GROWTH MEDIA; HIGH DENSITY; HIGHLY SENSITIVE; IONIZABLE GROUPS; MODEL-BASED; NANO SCALE; NANO-CARBON; SCHOTTKY BARRIERS; SENSOR RESPONSE;

EID: 78650084677     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/ja104850n     Document Type: Article
Times cited : (181)

References (45)
  • 16
    • 78650147852 scopus 로고    scopus 로고
    • lg curves, comparable to the situation for back-gating in ambient atmosphere. This is likely related to charges or dipoles trapped underneath the graphene, either in the bulk or on the surface of the oxide. These trapped charges can affect transport in graphene, because for electrolyte-gated graphene, we find that the back-gate coupling is sufficiently strong to affect device conductance, whereas for electrolyte-gated SWNTs, the effect of the back-gate and thus the effect of trapped charges are negligible due to screening of the electric field by the electrolyte that almost entirely encompasses the SWNT. See also ref 24
    • lg curves, comparable to the situation for back-gating in ambient atmosphere. This is likely related to charges or dipoles trapped underneath the graphene, either in the bulk or on the surface of the oxide. These trapped charges can affect transport in graphene, because for electrolyte-gated graphene, we find that the back-gate coupling is sufficiently strong to affect device conductance, whereas for electrolyte-gated SWNTs, the effect of the back-gate and thus the effect of trapped charges are negligible due to screening of the electric field by the electrolyte that almost entirely encompasses the SWNT. See also ref 24.
  • 17
    • 78650124918 scopus 로고    scopus 로고
    • lg curve shape from semiconducting (Figure 1 b) to graphene-like (Figure 1 d)
    • lg curve shape from semiconducting (Figure 1 b) to graphene-like (Figure 1 d).
  • 20
    • 78650126331 scopus 로고    scopus 로고
    • Because for large band gap devices the potential of minimum conductance is poorly measurable due to low current levels in the band gap, a threshold p-conductance value just above the noise level is used instead to define relative shifts of the potential of minimum conductance
    • Because for large band gap devices the potential of minimum conductance is poorly measurable due to low current levels in the band gap, a threshold p-conductance value just above the noise level is used instead to define relative shifts of the potential of minimum conductance.
  • 25
    • 78650078755 scopus 로고    scopus 로고
    • We have observed similar electrostatic gating effects as a function of ionic strength for suspended SWNT transistors (cf., Figure 4)
    • We have observed similar electrostatic gating effects as a function of ionic strength for suspended SWNT transistors (cf., Figure 4).
  • 26
    • 78650085987 scopus 로고    scopus 로고
    • 2 is covered by a single layer of graphene. Because the graphene is impermeable to even monatomic He-gas, (27) it is not at all obvious how the underlying silanol groups are ionized, which also substantiates the possibility of ionizable groups on graphene itself
    • 2 is covered by a single layer of graphene. Because the graphene is impermeable to even monatomic He-gas, (27) it is not at all obvious how the underlying silanol groups are ionized, which also substantiates the possibility of ionizable groups on graphene itself.
  • 31
    • 78650131711 scopus 로고    scopus 로고
    • This particular SWNT has a very small band gap such that the electronic transport properties display strong similarities to those of graphene (cf. Figure 1 e)
    • This particular SWNT has a very small band gap such that the electronic transport properties display strong similarities to those of graphene (cf. Figure 1 e).
  • 36
    • 78650109525 scopus 로고    scopus 로고
    • B T)
    • B T).
  • 39
    • 78650083787 scopus 로고    scopus 로고
    • To calculate the curves in Figure 7 b, an exponential band-bending profile with typical length-scale of 1 nm, independent of salt concentration, was used. See ref 8
    • To calculate the curves in Figure 7 b, an exponential band-bending profile with typical length-scale of 1 nm, independent of salt concentration, was used. See ref 8.
  • 40
    • 78650102617 scopus 로고    scopus 로고
    • note
    • lg curves for SWNTs in ref 13, we assumed that the band-bending profile at the contacts is given by the potential drop in the double layer. Thus, if the Debye length is longer at low salt, the Schottky barriers are wider, which would also lead to a decrease in p-type and n-type conductance. We, however, disregard this mechanism, because this Schottky-barrier-width effect is band gap dependent and should largely disappear for graphene, which we do not observe experimentally. We speculate that the reason for the absence of this effect is that, first, most of the electrostatic potential drop at the contact occurs over the thin Stern layer, which is independent of salt concentration. Secondly, the average position at which electrons tunnel from the metal into the SWNT is not likely to be exactly at the point where SWNT, metal, and electrolyte ions meet. (41) If the average entry point lies buried under the metal, the contribution of the potential profile in solution to the average Schottky-barrier width should decrease.
  • 43
    • 78650158784 scopus 로고    scopus 로고
    • Although we have also measured transport in graphene transistors at different pH, we observed a difference in hysteresis at different pH. Consequently, the relative curve shapes cannot be compared
    • Although we have also measured transport in graphene transistors at different pH, we observed a difference in hysteresis at different pH. Consequently, the relative curve shapes cannot be compared.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.