Bipyridyl 2 Carbon nanotubes 2 Chemiluminescence 2 Chemiluminescence sensors 2 ECL sensor Electrogenerated chemiluminescence 2 Electrogenerated chemiluminescence sensor 2 Film preparation 2 Glass membrane electrodes 2 Graphene 2 NADH 2 Nafion composite 2 Nicotinamide adenine dinucleotide hydrogen 2 Nicotinamide adenine dinucleotides 2 Ruthenium compounds 2 Sol-gels 2 Titania 2 Titanium dioxide 2 Tris(2,2′-bipyridyl)ruthenium(II) 2 electrogenerated chemiluminescence 2 graphene 2 tris(2,2′-bipyridyl)ruthenium(II) 2