This title appears in the Scientific Report :
2009
Please use the identifier:
http://dx.doi.org/10.1021/jp904777t in citations.
Layer-by-layer assembly of carbon nanotubes incorporated in light-addressable potentiometric sensors
Layer-by-layer assembly of carbon nanotubes incorporated in light-addressable potentiometric sensors
The integration of carbon nanotubes in conjunction with a chemical or biological recognition element into a semiconductor field-effect device (FED) may lead to new (bio)chemical sensors. In this study, we present a new concept to develop field-effect-based sensors, using a light-addressable potentio...
Saved in:
Personal Name(s): | Siqueira, J.R.Jr. |
---|---|
Werner, C.F. / Bäcker, M. / Poghossian, A. / Zucolotto, V. / Oliveira, O.N.Jr. / Schöning, M. J. | |
Contributing Institute: |
Institut für Bio- und Nanosysteme - Bioelektronik; IBN-2 JARA-FIT; JARA-FIT |
Published in: |
The @journal of physical chemistry |
Imprint: |
Washington, DC
Soc.
2009
|
Physical Description: |
14765 - 14770 |
DOI: |
10.1021/jp904777t |
Document Type: |
Journal Article |
Research Program: |
Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Journal of Physical Chemistry C
113 |
Subject (ZB): | |
Publikationsportal JuSER |
The integration of carbon nanotubes in conjunction with a chemical or biological recognition element into a semiconductor field-effect device (FED) may lead to new (bio)chemical sensors. In this study, we present a new concept to develop field-effect-based sensors, using a light-addressable potentiometric sensor (LAPS) platform modified with layer-by-layer (LbL) films of single-walled carbon nanotubes (SWNTs) and polyamidoamine (PAMAM) dendrimers. Film growth was monitored for each layer adsorbed on the LAPS chip by Measuring current-voltage (IIV) curves. The morphology of the films was analyzed via atomic force microscopy (AFM) and field-emission scanning electron microscopy (FESEM), revealing the formation of a highly interconnected nanostructure of SWNTs-network into the dendrimer layers. Constant current (CC) Measurements showed that the incorporation of the PAMAM/SWNT LbL film containing LIP to 6 bilayers onto the LAPS Structure has a high pH sensitivity of ca. 58 mV/pH. The biosensing ability of the devices was tested for penicillin G via adsorptive immobilization of the enzyme penicillinase atop the LgL film. LAPS architectures modified with the LbL film exhibited higher sensitivity, ca. 100 mV/decade, in comparison to ca. 79 mV/decade for all unmodified LAPS, which demonstrates the potential application of the CNT-LbL Structure in field-effect-based (bio)chemical sensors. |