Micorelectrochemical sensing and deposition within bubble film

We describe a novel electrochemical cell design with a thickness of about ۳۰ μm thatcomprises a carbon fiber electrode (۱۰ μm diameter) placed through a bubble wall (or stablesurfactant film) which serves as the solution. To create a durable surfactant film, we employed asolution infused with non-ionic Triton-X۱۰۰ surfactants. To do electroanalysis, a modified carbonmicroelectrode with nanosheet graphene oxide (as a sensing electrode) was placed through a soapbubble wall along with a ۱ mm diameter silver wire as the counter/reference electrode [۱]. Byusing this strategy, the proposed sensing system has demonstrated successful detection of NO۲-both on the hand and dissolved in Triton-X۱۰۰ surfactants film [۲-۳]. This technique holdsparticular significance in criminal investigations, as the presence of NO۲- ions on the hand isindicative of gunshot residue and can aid in identifying suspects. Therefore, this method is a rapidanalysis with a low limit of detection of ۲۸ μM and proves functinality for on-site sensing. To doelectrodeposition in a bubble wall, different ions such as silver and palladium ions were dissolvedwithin the bubble film, a bare carbon microelectrode is placed inside the bubble wall , and thesuitable cathodic potential is applied. The deposited metallic film was analyzed by scanningelectron microscopy (SEM) and energy-dispersive X-ray spectroscopy. The images obtained fromthe analysis revealed that the thickness of the bubble wall or electrochemical cell imposeslimitations on the electrodeposition area at the microscale level. Furthermore, the lifespan of thebubble wall played a crucial role in controlling the duration and thickness of the deposited filmfrom nanoscle to microscle [۳].

کلیدواژه ها:

Microelectrochmeistry ، Microdepostion ، Thin film ، Nitrite detection ، Bubble film.