Abstract
We designed the flexible chloride ion selective sensor that directly monitors electrochemical reactions of chloride ions without using a reference electrode. A flexible polytetrafluoroethylene (PTFE) substrate was utilized to provide bendability to the fabricated sensor. As an ion selective material, Ag nanoparticles were employed on the MWCNTs loaded on the PTFE substrate. Enhanced adsorption property of the fabricated sensor toward the chloride ions was given by incorporation of hydrophilic copper benzene-1,3,5-tricarboxylate (Cu-BTC) with great flexibility and stability. Accordingly, compared to the bare sensor the sensing performance of the Cu-BTC treated Ag NPs/AgCl electrode sensor was improved by indicating the decrease in response and recovery time about 4 times. It elucidated that the Cu-BTC layer could work as an effective medium between the Ag-NPs surface and electrolyte containing chloride ions. As a result of contact angle measurement, the hydrophilicity much increased in the Cu-BTC treated sensor because the exposed surface of the sensor not treated by the Cu-BTC largely consisted of hydrophobic MWCNTs. Furthermore, the Cu-BTC layer could hold the electrolyte for effective adsorption of analytes with large specific surface area.
Highlights
Chloride ion sensing is significant in researches such as medical examination (Warwick et al, 1986; Huber et al, 1998; Jiang et al, 1998), environmental monitoring (Elsener et al, 2003; Angst et al, 2010; Harris et al, 2016), and other numerous industrial fields (Badr et al, 1999; Da Silva et al, 2005; Babu et al, 2008)
The suitable reaction time chosen for the sensor fabrication was of 1 min in the electrolyte containing of 0.01 M AgNO3 and 0.1 M L-ascorbic acid which represented the securely-decorated Ag nanoparticles on the multiwalled carbon nanotubes (MWCNTs) without deterioration (Figure 3a)
Flexible chloride ion sensor based on MWCNT, silver nanoparticles, and Cu-BTC was investigated
Summary
Chloride ion sensing is significant in researches such as medical examination (Warwick et al, 1986; Huber et al, 1998; Jiang et al, 1998), environmental monitoring (Elsener et al, 2003; Angst et al, 2010; Harris et al, 2016), and other numerous industrial fields (Badr et al, 1999; Da Silva et al, 2005; Babu et al, 2008). Instead of the reference electrode, the change of electrical resistance by chloride ion adsorption on the Ag/AgCl electrode read as sensing signal transduced via MWCNTs as a channel. Compared to the bare sensor the sensing performance of the Cu-BTC treated Ag NPs/AgCl ion selective electrode sensor was improved by indicating the decrease in response and recovery time about 4 times at the same conditions. It elucidated that the Cu-BTC layer would work as an effective medium between the Ag-NPs surface and electrolyte containing chloride ions.
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