Solid State Science and Technology, Vol. 19, No 1 (2011) 20-25

ISSN 0128-7389

*Corresponding Author: akrajas@ukm.my

 

FLUORESCENCE GAS SENSOR BASED ON CdTe QUANTUM DOTS FOR

DETECTION OF VOLATILE ORGANIC COMPOUNDS GAS

Norhayati Abu Bakar1, Aidhia Rahmi1,Akrajas Ali Umar1.*, Muhamad Mat Salleh1 and Muhammad Yahaya2

 

 1Institute of Microengineering and Nanoelectronics (IMEN)

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

 2School of Applied Physics, Faculty of Science and Technology

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

 

ABSTRACT

The CdTe quantum dots (QDs) synthesized using a wet chemical process was utilized  an attempt to develop thin film sensor for detection of organic vapors. A sensor system  was setup, comprises an excitation light source made of laser diode, a dual arm fiber  optic probe, a spectrometer, a sensor chamber and a nitrogen gas for driving the vapor  sample from the vapor compartment. The QDs thin film was deposited by dropping  QDs solution onto the probe surface and let them dried in the ambient temperature. The  detection of organic vapors was done by comparing the photoluminescence (PL) spectra  the thin film exposed in the nitrogen gas and in organic vapors. The PL intensity of the  CdTe thin film was quenched by the presence organic vapors with the increasing of a  reaction of time until reached the saturation.

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