@article {Papadakis201921542,
	title = {Nanographene oxide-TiO<sub>2</sub> photonic films as plasmon-free substrates for surface-enhanced Raman scattering},
	journal = {Nanoscale},
	volume = {11},
	number = {44},
	year = {2019},
	note = {cited By 4},
	pages = {21542-21553},
	abstract = {The development of nanostructured semiconductors with tailored morphology and electronic properties for surface-enhanced Raman scattering (SERS) has been attracting significant attention as a promising alternative to conventional coinage metal SERS substrates. In this work, functionalized TiO2 photonic crystals by graphene oxide nanocolloids (nanoGO) are demonstrated as highly sensitive, recyclable, plasmon-free SERS substrates that combine slow-photon amplification effects with the high adsorption capacity and surface reactivity of GO nanosheets. Comparative evaluation of photonic band gap engineered nanoGO-TiO2 inverse opal films was performed on methylene blue SERS detection under different laser excitations in combination with rigorous theoretical simulations of the photonic band structure. A very low detection limit of 6 {\texttimes} 10-7 M and an enhancement factor of 5 {\texttimes} 104 along with excellent self-cleaning performance and reusability could be achieved by the interplay of slow-photon effects assisted by interfacial charge transfer between the analyte and the nanoGO-TiO2 semiconducting substrate. Slow-photon management in combination with judicious engineering of chemical enhancement in photonic nanostructures is accordingly proposed as an advanced approach for the design of efficient dielectric SERS substrates. {\textcopyright} 2019 The Royal Society of Chemistry.},
	doi = {10.1039/c9nr07680h},
	url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85074965933\&doi=10.1039\%2fc9nr07680h\&partnerID=40\&md5=1e1c656e4551debd95f650d88ec88a87},
	author = {D. Papadakis and Diamantopoulou, A. and P.A. Pantazopoulos and D. Palles and E. Sakellis and N. Boukos and N. Stefanou and V. Likodimos}
}
