Page 21 - tech fest 2025 ב״ש חוברת תקצירים

Development of an Electrochemical Sensor to Detect Cadmium Metal Based on the 1,8- Diaminonaphthalene Ligand and Dip-Pen Nanolithography (DPN)
ChE-D-04
Kristina Binyamin; kristina.binyamin@gmail.com
Advisors: Prof. Ariela Burg1, Ms. Ron Peretz1 1SCE - Shamoon College of Engineering, Be’er-Sheva
Water contamination by cadmium poses a significant environmental and health risk due to its toxicity and bioaccumulative nature. This study presents a new approach for detecting cadmium in water at ultralow concentrations, using an electrochemical sensor based on the 1,8-diaminonaphthalene ligand and using DPN. The current approach involves preparing solutions with different cadmium concentrations and testing two effects. Comparing pH3 and pH5, it was found that the optimal pH for detection is pH5, with a LoD value of 0.40 ppb. Studying the distances between the nanoclusters indicated that the exposed electrode surface area and the number of nanoclusters both influence sensor sensitivity in opposing ways, with maximum sensitivity achieved at a spacing of 6.6μm.
Keywords: 1,8-diaminonaphthalene, cadmium, DPN, electrochemical sensor
Study of Water Oxidation Using Patterned Electrodes Containing Ruthenium Complex
ChE-D-05
Noa Solomon; noaso@ac.sce.ac.il
Advisors: Prof. Ariela Burg1, Ms. Shiran Aharon1 1SCE - Shamoon College of Engineering, Be’er-Sheva
Water oxidation for hydrogen production offers a clean, sustainable energy solution. The main challenge lies in the reaction’s energy barrier, which may be addressed using a ruthenium catalyst, due to its efficiency and potential to absorb visible light.
The goal of this project is to develop electrodes that incorporate the known water oxidation catalyst [Ru(tpy)(bpy)(OH2)](ClO4)2 (tpy=2,2′:6′2′′-terpyridine, bpy=2,2'-bipyridyl) to create a heterogeneous photoelectrochemical system. Two types of electrodes, coated and patterned, were fabricated using dip-pen nanolithography (DPN), incorporating varying amounts of the catalyst.
The results showed that the patterned electrodes produced higher currents in the dark and under illumination, indicating efficiency in water oxidation. These findings highlight the potential of DPN for improving electrode performance, advancing efficient water-splitting technologiesand promoting hydrogen as a viable clean energy source.
Keywords: alternative energy, hydrogen production, photoelectrochemical water oxidation reaction, ruthenium catalyst
Book of Abstracts | 2025
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