Preparation and Characterization of PEDOT:PSS/CNT Blends for Light Addressable Electrochemical Sensing
Presentation Type
Poster
Faculty Advisor
Glen O'Neil
Access Type
Event
Start Date
26-4-2024 12:45 PM
End Date
26-4-2024 1:44 PM
Description
In hopes of improving the efficacy and understanding of our sensors, it was decided to etch the silicon in a KOH/IPA solution prior to Ammonium fluoride etching to determine if better results were provided. A long-standing goal of our group is to develop methods to probe cellular communication with high spatio-temporal resolution. To accomplish this goal, we use light-addressable electrochemical (LAE) sensors, which are photoelectrochemical sensors that can be turned on and off using visible light as a stimulus. Until recently, all of the work in our group has used atomically flat single crystal Si. Here, we investigate the anisotropic etching of silicon through KOH/IPA etch to form pyramid structures along the side of silicon used for the creation of sensors. We hypothesize that these structures may have a higher potential to capture and keep light within the pyramids due to the geometry of the pyramids. We characterized the electrochemistry of these photoelectrodes using cyclic voltammetry and ferrocene methanol and correlated the results with the time exposed to the KOH/IPA etch.We supported these electrochemical data with electron microscopy to characterize the geometry of the pyramids. The results portrayed a trend in which the etching time was directly proportional to the uniformity and expansion of the pyramids. We find that the etch time has a dramatic influence on the cyclic voltammetry and may be useful for improving the sensitivity of sensors based on these photoelectrodes.
Preparation and Characterization of PEDOT:PSS/CNT Blends for Light Addressable Electrochemical Sensing
In hopes of improving the efficacy and understanding of our sensors, it was decided to etch the silicon in a KOH/IPA solution prior to Ammonium fluoride etching to determine if better results were provided. A long-standing goal of our group is to develop methods to probe cellular communication with high spatio-temporal resolution. To accomplish this goal, we use light-addressable electrochemical (LAE) sensors, which are photoelectrochemical sensors that can be turned on and off using visible light as a stimulus. Until recently, all of the work in our group has used atomically flat single crystal Si. Here, we investigate the anisotropic etching of silicon through KOH/IPA etch to form pyramid structures along the side of silicon used for the creation of sensors. We hypothesize that these structures may have a higher potential to capture and keep light within the pyramids due to the geometry of the pyramids. We characterized the electrochemistry of these photoelectrodes using cyclic voltammetry and ferrocene methanol and correlated the results with the time exposed to the KOH/IPA etch.We supported these electrochemical data with electron microscopy to characterize the geometry of the pyramids. The results portrayed a trend in which the etching time was directly proportional to the uniformity and expansion of the pyramids. We find that the etch time has a dramatic influence on the cyclic voltammetry and may be useful for improving the sensitivity of sensors based on these photoelectrodes.