Recent progress in sensing application of metal nanoarchitecture-enhanced fluorescence

Abstract

Fluorescence analytical method, as a real time and in situ analytical approach to target analytes, can offer advantages of high sensitivity/selectivity, great versatility, non-invasive measurement and easy to transmit over...

Electric Field Tunability of Photoluminescence from a Hybrid Peptide–Plasmonic Metal Microfabricated Chip

“…The red shift of the QD nanocrystal photoluminescence is attributed to the interactions between the permanent dipole moment of the QD nanocrystals and the dipole moment induced in the AgNPs. 20 A similar change in the RhB fluorophore emission peak wavelength and line width was found ( Figure S12 ). Relatively low quantum yield (QY) molecules at a concentration of 10 –8 M were also investigated such as crystal violet (CV) ( Figure S13 ), and a significant increase of ∼34-fold in PEF intensity was seen.…”

“…Studies have reported that PEF emission spectra from QD nanocrystals are spectrally red shifted in addition to an enhancement in fluorescence signal strength when they are coupled with localized plasmons. 20 Additionally, it has been reported that the red shift of the QD nanocrystal photoluminescence can be assigned to the exchanges between the transition dipole moments or electronic states of the QD nanocrystals and the dipole moment induced in the AgNPs, 20 while the fluorescence emission fwhm of QD nanocrystal emitters is reduced as a result of the stronger interaction with localized plasmons. 20 This is in agreement with theoretical calculations ( Figure 2 c, as outlined above), which showed that negatively charging the AgNP can create a new plasmon resonance frequency more in resonance with the QD emission frequency, leading to a stronger interaction of the QD nanocrystal emitter with localized plasmons.…”

“… 20 Additionally, it has been reported that the red shift of the QD nanocrystal photoluminescence can be assigned to the exchanges between the transition dipole moments or electronic states of the QD nanocrystals and the dipole moment induced in the AgNPs, 20 while the fluorescence emission fwhm of QD nanocrystal emitters is reduced as a result of the stronger interaction with localized plasmons. 20 This is in agreement with theoretical calculations ( Figure 2 c, as outlined above), which showed that negatively charging the AgNP can create a new plasmon resonance frequency more in resonance with the QD emission frequency, leading to a stronger interaction of the QD nanocrystal emitter with localized plasmons. The red shift of the QD nanocrystal photoluminescence is attributed to the interactions between the permanent dipole moment of the QD nanocrystals and the dipole moment induced in the AgNPs.…”

“… 14 , 15 The interaction between the fluorophore and a metallic surface can result in the reduction of fluorescence when the fluorophore is separated from the metal surface by less than a few nanometers, 10 , 16 − 19 and yet enhanced fluorescence has also been observed for fluorophores in contact with silver nanoparticles (AgNPs). 20 A number of techniques have been used to make PEF emission substrates, including top-down lithographic methods including e-beam lithography, 10 , 14 , 21 colloidal lithography, 22 vacuum evaporation, 23 and nanoimprinting. 24 These techniques generally have a limitation, either high cost or lack of reproducibility or sensitivity.…”

Effect of gold and silver nanoparticles on the detection of Ciprofloxacin in clinical wastewater by europium and terbium complexes

“…Furthermore, by exploiting various metal nanoarchitectures to manipulate fluorescence, both increased fluorescence quantum yield and improved photostability can be realized. [11].…”