Localized surface plasmon resonance nanochips with molecularly imprinted polymer coating for explosives sensing

Abstract

Sensor elements based on localized surface plasmon resonance phenomenon in arrays of Au nanostructures on glass substrates (nanochips) with molecularly imprinted acrylamide copolymer coating have been proposed for explosives analogues sensing in liquid and vapor phase. Nanochips exhibited detection limits of 1 pM in aqueous solution and 0.1 ppm in gaseous state against 4-nitrophenol. Vapor phase sensing of 4-nitrotoluene, 1-nitronaphthalene and 5-nitroisoquinoline using the developed 4-nitrophenol-imprinted plasmonic nanochips demonstrated partially selective response with time to signal saturation starting from 2 minutes.

Tuning the photoluminescence of CdTe quantum dots by controllable coupling to plasmonic Au nanoparticles

“…One of their major advantages over bulk semiconductor counterparts and organic semiconductors and chromophores is the tunable narrow-band photoluminescence (PL) and optical absorption spectra which can cover the whole optical range from UV to NIR [4]. A controllable increase or decrease of the QD PL intensity via their coupling to plasmonic nanoparticles (NPs) is the basis for many potential optoelectronic and sensing applications [5,6,[15][16][17][7][8][9][10][11][12][13][14]. The underlying mechanism is an interplay of the absorption and PL enhancement by a strong electric field of the localized surface plasmon resonance (LSPR) of noble metal NPs and PL decrease due to non-radiative charge and energy transfer between the QD and NP.…”