Assembled nanoparticle films with crown ether–metal ion “sandwiches” as sensing mechanisms for metal ions
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Specialized nanoparticles known as monolayer-protected clusters (MPCs) were affixed with metal selective crown ether (CE) functional groups and assembled into novel thin films to form potential metal ion sensing materials. Films of MPCs modified with potassium specific 15-crown-5 ligands (CE-MPCs) were successfully assembled using both dithiol linkages and ester-coupling reactions. Film responses to potassium are observed spectroscopically as the manifestation of changing interparticle spacing within a film in the presence and absence of potassium. Growth dynamics, film structure, and metal response are examined. Additionally, the important role of flexibility, especially in the interconnectivity of the CE-MPCs within the film and between the CE groups themselves, is experimentally identified.
KeywordsCrown Ether Core Size Dithiol Interparticle Spacing Surface Plasmon Band
This research was generously supported by grant funding from Virginia’s Commonwealth Health Research Board and the National Science Foundation (CHE-0303830). We would also like to acknowledge Sheri Notte, Dr. Chris Stevenson, and Dr. Robert Miller of the University of Richmond for their assistance and hard work on this research.
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