title: Covalently functionalized double-walled carbon nanotubes combine high sensitivity and selectivity in the electrical detection of small molecules.
abstract: Atom-thick materials such as single-walled carbon nanotubes (SWCNTs) and graphene exhibit ultrahigh sensitivity to chemical perturbation partly because all of the constituent atoms are surface atoms. However, low selectivity due to nonspecific binding on the graphitic surface is a challenging issue to many applications including chemical sensing. Here, we demonstrated simultaneous attainment of high sensitivity and selectivity in thin-film field effect transistors (TFTs) based on outer-wall selectively functionalized double-walled carbon nanotubes (DWCNTs). With carboxylic acid functionalized DWCNT TFTs, we obtained excellent gate modulation (on/off ratio as high as 4000) with relatively high ON currents at a CNT areal density as low as 35 ng/cm(2). The devices displayed an NH(3) sensitivity of 60 nM (or ~1 ppb), which is comparable to small molecule aqueous solution detection using state-of-the-art SWCNT TFT sensors while concomitantly achieving 6000 times higher chemical selectivity toward a variety of amine-containing analyte molecules over that of other small molecules. These results highlight the potential of using covalently functionalized double-walled carbon nanotubes for simultaneous ultrahigh selective and sensitive detection of chemicals and illustrate some of the structural advantages of this double-wall materials strategy to nanoelectronics.
authors: Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.
authors: Jia
authors: J
authors: Huang
authors: Allen L
authors: AL
authors: Ng
authors: Yanmei
authors: Y
authors: Piao
authors: Chien-Fu
authors: CF
authors: Chen
authors: Alexander A
authors: AA
authors: Green
authors: Chuan-Fu
authors: CF
authors: Sun
authors: Mark C
authors: MC
authors: Hersam
authors: Cheng S
authors: CS
authors: Lee
authors: YuHuang
authors: Y
authors: Wang
mesh_terms: D000641:Ammonia / Q000032:analysis*; D002264:Carboxylic Acids / Q000737:chemistry; D004581:Electronics; D006108:Graphite / Q000737:chemistry; D037742:Nanotubes, Carbon / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D002264:Carboxylic Acids; D037742:Nanotubes, Carbon; D000641:Ammonia; D006108:Graphite