TY - JOUR
T1 - CdSe quantum dots embedded in matrices
T2 - Characterization and application for low-pressure and temperature sensors
AU - Ke, Tung Ting
AU - Lo, Yu Lung
AU - Sung, Ti Wen
AU - Liao, Chia Chi
N1 - Funding Information:
This work was supported in part by the Ministry of Science and Technology, Taiwan, under Contract 104-2221-E-006-125-MY2 and Contract 104-3113-E-006-002 and in part by the Ministry of Education, Taiwan.
Publisher Copyright:
© 2016 IEEE.
PY - 2016/4/15
Y1 - 2016/4/15
N2 - Low-pressure and temperature optical sensors based on CdSe quantum dots (QDs) embedded in four different matrices [toluene, polymethyl methacrylate (PMMA), polydimethylsiloxane (PDMS), and epoxy] are presented. The emission intensity and photoluminescent (PL) shift of the four sensors are evaluated over pressures in the range of 0 (for gauge pressure at 1 atm) ∼180 psi. It is shown that all four sensors enable the pressure to be reliably detected over the considered range. Of the four sensors, that consisting of QDs embedded in PDMS exhibits the greatest variation in the peak emission wavelength as the pressure is increased. However, the PMMA-based sensor has the greatest sensitivity of the four sensors to changes in the pressure. For a constant pressure of 0 psi (gauge pressure), the thermal quenching effect of all four sensors increases as the temperature is increased from 30 °C to 75 °C. It is observed that all four sensors have an approximately linear response over the considered temperature range. Moreover, all four sensors exhibit a red-shift phenomenon in the PL spectrum at higher temperatures. In general, the results presented in this paper suggest that QDs embedded in a matrix provide a feasible approach for realizing both pressure sensing and temperature sensing applications.
AB - Low-pressure and temperature optical sensors based on CdSe quantum dots (QDs) embedded in four different matrices [toluene, polymethyl methacrylate (PMMA), polydimethylsiloxane (PDMS), and epoxy] are presented. The emission intensity and photoluminescent (PL) shift of the four sensors are evaluated over pressures in the range of 0 (for gauge pressure at 1 atm) ∼180 psi. It is shown that all four sensors enable the pressure to be reliably detected over the considered range. Of the four sensors, that consisting of QDs embedded in PDMS exhibits the greatest variation in the peak emission wavelength as the pressure is increased. However, the PMMA-based sensor has the greatest sensitivity of the four sensors to changes in the pressure. For a constant pressure of 0 psi (gauge pressure), the thermal quenching effect of all four sensors increases as the temperature is increased from 30 °C to 75 °C. It is observed that all four sensors have an approximately linear response over the considered temperature range. Moreover, all four sensors exhibit a red-shift phenomenon in the PL spectrum at higher temperatures. In general, the results presented in this paper suggest that QDs embedded in a matrix provide a feasible approach for realizing both pressure sensing and temperature sensing applications.
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U2 - 10.1109/JSEN.2016.2521865
DO - 10.1109/JSEN.2016.2521865
M3 - Article
AN - SCOPUS:84962129700
VL - 16
SP - 2404
EP - 2410
JO - IEEE Sensors Journal
JF - IEEE Sensors Journal
SN - 1530-437X
IS - 8
M1 - 7393437
ER -