Health & Environmental Research Online (HERO)


Print Feedback Export to File
8407342 
Journal Article 
Chemically sensitive resistors based on monolayercapped cubic nanoparticles: Towards configurable nanoporous sensors 
Dovgolevsky, E; Tisch, U; Haick, H 
2009 
1 
Small
ISSN: 1613-6810
EISSN: 1613-6829 
5 
10 
1158-1161 
English 
The 3D films made of cubic nanoparticles (NP) capped with organic monolayers were shown to provide significantly higher sensitivity towards volatile organic compounds (VOC) than similar films made of spherical NPs. Polyacrylate-capped cubic Pt NPs and polyvinylpyrorolidone-capped spherical Pt NPs with a characteristic dimension of 6.0∓0.4 nm were synthesized by hydrogen and heat procedures respectively. The results show that the resistances of DDT-capped cubic and spherical Pt NP films on interdigitated electrodes are 0.35 and 0.44MΩ. The condensation process in the pores is found to induce swelling in the film, increase the interparticle distance, and lead to high responses. The relative change in thickness of DDT-capped cubic-NP films upon exposure to 0.005 undercane, octane, and hexane is 8.9, 6.3, and 5.3-fold higher than for DDT-capped spherical NPs. 
Chemiresistors; Materials; Metals; Nanoparticles; Nanoporous; Sensors