Calixarene functionalization of TiO2 nanoarrays: an effective strategy for enhancing the sensor versatility

Sensitive, selective, low-cost, and simply designed sensors for gases and analytes are highly attractive. The rational synergy between calixarenes (CAs) and titania nanorods (TiO2NRs) and nanotubes (TiO2NTs) gives rise to completely new types of behaviors that open unprecedented applications. First,...

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Published inJournal of materials chemistry. A, Materials for energy and sustainability Vol. 6; no. 23; pp. 10649 - 10654
Main Authors Oueslati, Issam, Ghrairi, Akrem, Ribeiro, Edivagner S, Luís A E Batista de Carvalho, Gil, João M, Paixao, José A
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 2018
Subjects
Calixarenes
Cost analysis
Diffusion rate
Gaseous diffusion
Gases
Nanorods
Nanotechnology
Nanotubes
Pesticides
Self-assembled monolayers
Self-assembly
Sensors
Titanium dioxide
Transduction
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Summary:Sensitive, selective, low-cost, and simply designed sensors for gases and analytes are highly attractive. The rational synergy between calixarenes (CAs) and titania nanorods (TiO2NRs) and nanotubes (TiO2NTs) gives rise to completely new types of behaviors that open unprecedented applications. First, the geometric building of NRs and NTs leads to excellent signal amplification and transduction. Second, grafted CAs create self-assembled monolayers (SAMs) that switch order under a thermal stimulus and generate a stimuli-responsive behavior, thus promoting modulated sensing properties. Third, CAs accelerate gas diffusion in the sensor, yielding a fast, sensitive, selective, and reproducible response to H2 at room temperature (RT). In addition, these systems may act as sensors for other analytes, such as the pesticide profenofos (PFF).
ISSN:2050-7488
2050-7496
DOI:10.1039/c8ta01906a