Composite-Nanoparticles Thermal History Sensors
Abstract
In the three years of this grant, thermal history dependences of the photoluminescence spectrum of several types of core-shell quantum dots (QDs) were studied as well as structural determination on transmission electron microscopy (TEM). These quantum dots (QDs) were studied in a broad temperature range from room temperature to over 500 degrees Celsius. Photoluminescence (PL) of core/shell CdSe/ZnS QDs in different sizes was used as a tool to examine their interfacial mass diffusion processes due to temperature change. The PL of core/shell CdSe/ZnS QDs in size of ~5 nm shows strong dependence on their temperature history. The PL signal could be detected after QD samples were heated up to 500 degrees Celsius in a time frame of seconds. The blue-shift of the PL spectra with increasing temperature and heating time provides an optical route to read out the thermal history. A quantitative relationship between peak-shift and heating temperature has been established on CdSe QDs. We showed that the heating history can be read out by the combination of two kinds of quantum dots.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 2014
- Accession Number
- ADA600211
Entities
People
- Gang Chen
- Zhifeng Ren
Organizations
- Massachusetts Institute of Technology