Energy transfer of CdSe/ZnS nanocrystals encapsulated with rhodamine-dye functionalized poly(acrylic acid)

Abstract

Energy transfer between a CdSe/ZnS nanocrystal (NC) donor and a rhodamine isothiocyanate (RITC) acceptor has been achieved via a functionalized poly(acrylic acid) (PAA) encapsulating layer over the surface of the NC. The modification of PAA with both N-octylamine (OA) and 5-amino-1-pentanol (AP), [PAA-OA-AP], allows for the simultaneous water-solubilization and functionalization of the NCs, underscoring the ease of synthesizing NC-acceptor conjugates with this strategy. Photophysical studies of the NC-RITC constructs showed that energy transfer is efficient, with kFRET approaching 108 s−1. The ease of the covalent conjugation of molecules to NCs with PAA-OA-AP coating, together with efficient energy transfer, makes the NCs encapsulated with PAA-OA-AP attractive candidates for sensing applications.

Chaotic oscillation and random-number generation based on nanoscale optical-energy transfer

“…Similar optical-excitation transfer via near-field interactions has been reported for various material systems, including CuCl QDs 11 , InAs QDs 32 , CdSe QDs 33 , and hybrid systems 13 14 . Also, the theoretical foundations describing such phenomena, including the optimal near-field interaction that maximizes optical excitation transfer, have been developed by Sangu et al in Ref.…”

Analysis of optical near-field energy transfer by stochastic model unifying architectural dependencies

“…1,2 Its theoretical fundamentals have been explained by local optical near-field interactions, 3,4 which describe optical energy transfer involving conventionally dipole-forbidden transitions, and the model predictions are in agreement with experimental demonstrations based on CdSe quantum dots (QDs), 5 ZnO quantum wells (QWs), 6 and ZnO QDs, 7 among others. 8,9 Higher-order multipolar interactions due to localized near-fields that break electric-dipole selection rules have also been discussed in the literature.…”

“…1,2 Its theoretical fundamentals have been explained by local optical near-field interactions, 3,4 which describe optical energy transfer involving conventionally dipole-forbidden transitions, and the model predictions are in agreement with experimental demonstrations based on CdSe quantum dots (QDs), 5 ZnO quantum wells (QWs), 6 and ZnO QDs, 7 among others. 8,9 Higher-order multipolar interactions due to localized near-fields that break electric-dipole selection rules have also been discussed in the literature. [10][11][12][13] Optical energy transfer on the nanoscale has been applied to a variety of applications, including energy concentration, 14 logic circuits, 15 engineered color rendering for solid state lighting, 16 and computing paradigms beyond the conventional von Neumann architecture, 17 thanks to its unique attributes, such as the ability to break through the diffraction limit of light, high energy efficiency, 18 and spatiotemporal dynamics.…”

Luminescence Enhancement of ZnS:Cu Nanocrystals by Zinc Sulfide Coating with Core/Shell Structure

“…The semiconductor NCs, passivated by inorganic materials with wide bandgap, have been developed and shown dramatically enhanced properties [24]. Enhanced luminescence properties has been observed in ZnS/SiO 2 NCs [25], CdSe/ZnS NCs [6], ZnS:Mn/ZnO NCs [26], and ZnS:Mn/Zn(OH) 2 NCs [27]. However, until now, there is few research on passivated ZnS:Cu materials.…”

“…CdSe [1][2][3], ZnS [4][5][6][7]) have attracted much attention in recent years with their unique physical and chemical properties. However, experimental results indicate that any leakage of Cd from the Cd-based II-VI NCs would be toxic and fatal to a biological system [8], and cadmium-containing products are eventually environmentally problematic.…”