Cobalt Phthalocyanine Surface Acoustic Wave Sensor for Chloride Sensing in Water Samples

Fourati Najla, Zerrouki Chouki, Singh Ajay, Samanta Soumen, Aswal Dinesh K
2017 Current Trends in Analytical and Bioanalytical Chemistry  
A 104 MHz Surface Acoustic Wave (SAW) sensor functionalized with a 100 nm thick Cobalt Phthalocyanine (CoPc) layer was investigated for chloride sensing in liquid media. Atomic force microscopy was first investigated to characterize the morphology of three phthalocyanine molecules, Pc, CoPc and FePc, deposited by molecular beam epitaxy on the SAW sensing area. CoPc was chosen for its particular columnar shape, highly suitable for sensing applications. Gravimetric results indicate that the Limit
more » ... cate that the Limit of Detection (LOD) of the developed CoPc-SAW sensor was of order of 0.2 µM, and that the corresponding sensitivity was equal to (0.148 ± 0.001) °µM -1 . Recognition and release average time constants were estimated at (45 ± 7) s and (74 ± 4) s respectively.
doi:10.36959/525/436 fatcat:efffxu7avjb6xghsnmlpdyjcre