{'fraction_non_alphanumeric': 0.020682523267838676, 'fraction_numerical': 0.0, 'mean_word_length': 5.865248226950355, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Spectroscopic fiber probes for chemical sensing based on LbL self assembled ultra-thin films

Electrostatic Layer-by-Layer self-assembly (LbL) is an attractive method for depositing films, composed of charged molecules, on a wide variety of charged substrates. This report describes progress toward development of LbL as a platform for fabrication of fluorescent sensors based on nanocomposite multilayer ultra-thin films. Two types of fiber probes have been fabricated to demonstrate this concept: oxygen sensing Ruthenium-based multilayer films with additional reference fluorophore allowing ratiometric measurements, and multilayer films containing a pH-sensitive fluorophore assembled on imaging fiber bundles. This work provides a basis for development of sensors for numerous biomedical sensing applications, including fiber-optic probes for research and clinical measurements and implantable micro/nanoparticle based sensors for in vitro or in vivo monitoring.