id	keyword
american_scientific_journal-2280	zno
american_scientific_journal-2280	films
american_scientific_journal-2280	thin
american_scientific_journal-2280	lattice
american_scientific_journal-2280	properties
american_scientific_journal-2280	doping
american_scientific_journal-2280	azo
american_scientific_journal-2280	size
american_scientific_journal-2280	journal