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Home Environmental Calixarene Based Chemosensors

Calixarene Based Chemosensors

Description

Array of quartz crystal resonators covered with films of various organic sorptive materials (calixarenes, polymers) which have different sensitivity towards different volatile organic molecules was developed. This device belongs to non-flow type, i.e. after injection of analyte vapor working cell is cut off and no flow of analyte occurs under measuring stage. Due to adsorption of analyte molecules onto sensitive surfaces of sensors frequency of quartz resonators is reducing. This frequency shift is considered as a sensor response. Obtained array of sensors responses to pulse of analyte vapor is used for “teaching” system and after that – for recognition of chemical image of analyte by means of special mathematical apparatus for statistical treatment (PCA, Neural Network, etc.). After measurements working cell and sensors are cleaned with fresh dry air.

Innovative Aspect and Main Advantages

Calixarene based Electronic Nose is used for:

  • monitoring of hazardous pollutants in environment;
  • quality control in food industry and agriculture;
  • quality control of perfumes and beverages.

Kinetic response strongly depends on interaction between sensitive layer and analyte molecules. Thus, choosing array for given purpose we consider physical-chemical features of sensitive layers.


Fig. 1 Response of several sensors to various analytes

Areas of Application

  • Monitoring of hazardous pollutants in environment
  • Quality control in food industry and agriculture
  • Quality control of perfumes and beverages
  • Detection of drugs and explosives in customer service


Fig. 2 CALIXARENE BASED CHEMOSENSOR
GAZ-1
Main technical characteristics:
Working cell volume - 9 sm3
Number of channel - 8;
Frequency drift - less 0.5 Hz/ 1h
Counter range 0–16 MHz;
Resolution - 1 Hz;
Time single freq. count. - 1s;
Time of measuring for recognition - less 5 min;
Number of recognizing chem. images - more 10;
Range of analyte concentration - 10–10000 ppm;
Working temperature - 20–30;
Software - DOS, Win9X;
Power supply - 12V/0.4A


Fig. 3 Schematic view of “GAZ-1”
1. Teflon gas cell
2. 8-element QCM-sensor array
3. Air pump
4. Filter-desiccant
5. Two-positioned gas flow control valve
6. Syringe–filler
7. Analyte vapor
8. Analyte container
9. Analyte probe
10.End injection sensor

Stage of Development

The series of calixarene based receptors of ions and neutral molecules were synthesized in the Institute of Organic Chemistry NASU (see www.ioch.kiev.ua/calix )

The sensitive calixarene based polymer films were prepared in the Institute of Macromolecular Chemistry NASU

The several chemosensor devices were constructed in the Institute of Semiconductor Physics NASU.

Contact Details

Vitaly KALCHENKO
Institute of Organic Chemistry National Academy of Sciences of Ukraine
Murmanskaya str. 5, 02660 Kiev-94, Ukraine
Tel +38-044 551 0616
Fax +38-044 573 2643
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

Alexander BELYAEV
Institute of semiconductor physics National Academy of Sciences of Ukraine
41, Pr. Nauki, 03028 Kiev-28, Ukraine
Tel: +380-44-2651827
Fax: +380-44-2651827
e-mail This e-mail address is being protected from spambots. You need JavaScript enabled to view it

Sergey RIABOV
Institute of Macromolecular Chemistry National Academy of Sciences of Ukraine
48, Kharkovskoe Shosse, 02160 Kiev-160, Ukraine
Tel. +380.44- 559 36 95
Fax: +380.44- 552 40 64

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