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Letter

Single Quantum Dots as Local Temperature Markers

Sha Li,^†^‡ Kai Zhang,^†^§ Jui-Ming Yang,*^‡ Liwei Lin,^‡ and Haw Yang^§

Berkeley Sensor and Actuator Center, Department of Mechanical Engineering, and Department of Chemistry, University of California at Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720

Nano Lett., 2007, 7 (10), pp 3102–3105

DOI: 10.1021/nl071606p

Publication Date (Web): August 30, 2007

†

Equal contribution authors.

‡

Berkeley Sensor and Actuator Center, Department of Mechanical Engineering, University of California at Berkeley.

Department of Chemistry, University of California at Berkeley, and Physical Biosciences Division, Lawrence Berkeley National Laboratory.

Corresponding author. E-mail: juimingy@berkeley.edu.

Abstract

This work describes noncontact, local temperature measurements using wavelength shifts of CdSe quantum dots (QDs). Individual QDs are demonstrated to be capable of sensing temperature variations and reporting temperature changes remotely through optical readout. Temperature profiles of a microheater under different input voltages are evaluated based on the spectral shift of QDs on the heater, and results are consistent with a one-dimensional electrothermal model. The theoretical resolution of this technique could go down to the size of a single quantum dot using far-field optics for temperature characterizations of micro/nanostructures.

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