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We describe tunable sensitivity and linearity of layer-by-layer (LbL) self-assembled single-walled carbon nanotube (SWCNT) thin-film composites as a pH sensor by means of silica nanoparticles (SNPs). The SWCNT thin-film devices without and with SNP layer were fabricated with LbL self-assembly and characterized electrochemically in pH buffers. The role of SNPs in SWCNT thin-film chemoresistors and...
An all single-walled carbon nanotube film was deposited through layer-by-layer self-assembly without use of a copolymer, resulting in 75% reduction of resistivity compared to previous composite films made with copolymer. The deposited film thickness could be well controlled by changing the number of dipping cycles. Moreover, a 3-terminal electromechanical switch built with this thin film behaved like...
This paper demonstrates a highly sensitive humidity sensor based on carbon nanotube and poly(dimethyldiallylammonium chloride) composite films. The composite film is deposited between interdigitated electrodes on a Si/SiO2 substrate through layer-by-layer self-assembly technique. The resistance stability of the composite film is effectively improved through thermal annealing, and I-V characteristic...
We present ion-sensitive conductometric glucose sensors prepared by layer-by-layer (LbL) nano self-assembly of single-walled carbon nanotube (SWNT) and enzyme glucose oxidase (GOx). The carboxylated SWNT and GOx are self-assembled alternatively with a positively charged polyelectrolyte, poly(diallyldimethylammonium chloride, PDDA). Quartz crystal microbalance (QCM) study and Fourier transform infrared...
A low-cost, flexible, and disposable immunosensor is presented in this paper. The single-walled carbon nanotubes (SWNT) and biomolecules are self-assembled on micro patterned electrodes. The immuno-chip acts as the platform of a horseradish peroxidase (HRP) labeled sandwiched Enzyme-Linked Immunosorbent Assay (ELISA). The pH change induced by the biochemical reactions influences the electrical conductance...
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