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Nanoplatforms for Plasmon‐Induced Heating and Thermometry
Author(s) -
Debasu Mengistie L.,
Brites Carlos D. S.,
Balabhadra Sangeetha,
Oliveira Helena,
Rocha João,
Carlos Luís D.
Publication year - 2016
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201600061
Subject(s) - plasmon , nanorod , thermometer , materials science , nanoscopic scale , nanotechnology , nanosensor , optoelectronics , physics , quantum mechanics
Plasmonic nanostructures concentrate light and heat within a small volume at the nanoscale, offering potential applications in nanotechnology and biomedicine (e.g., hyperthermia). However, the precise quantification of the actual temperature rise in the vicinity of such nanosystems poses considerable challenges. Here, we present a new heater–thermometer nanoplatform capable of measuring the plasmon‐induced local temperature increase of Au nanorods via the ratiometric upconversion of (Gd,Yb,Er) 2 O 3 nanothermometers upon 980 nm laser excitation (up to 102.0 W cm −2 ). The local temperature rise, 302–548 K (maximum temperature sensitivity 1.22 % K −1 , uncertainty 0.32 K and repeatability >99 %), is assessed using Boltzmann's distribution of the Er 3+ 2 H 11/2 → 4 I 15/2 / 4 S 3/2 → 4 I 15/2 intensity ratio. The nanoplatforms are biocompatible with MG‐63 and A549 cells and were mapped within the former using hyperspectral imaging, opening up an avenue to monitor the cellular uptake of Ln 3+ ‐based nanoplatforms.