System for detecting volatile organic compounds and the method for forming the same and utility thereof

Patent metadata

Field	Value
Publication number	US-9146222-B2
Application number	US-201313860839-A
Country	US
Kind code	B2
Filing date	Apr 11, 2013
Priority date	Oct 11, 2012
Publication date	Sep 29, 2015
Grant date	Sep 29, 2015

Abstract

The system for detecting volatile organic compounds (VOCs) of this present invention comprises a detecting material made by blending a nano-material and a conductive polymer. The system for detecting VOCs presents the property of high sensitivity, high sensing accuracy, quick response, and real-time VOC detecting, and is demonstrated in the present work for commercialization usage. The system for detecting VOCs can be easily operated to detect VOC without electronic detecting method, and hence this invention can reduce a lot of operation energy and procedure. Furthermore, when adding inorganic nanoparticles, the area of VOC exposure of this invention is increased and the molecular morphology variation of the detecting material is enhanced, and hence the detecting activity of the system for detecting VOCs is improved.

First claim

What is claimed is:

1. A detecting material for detecting volatile organic compounds (VOCs), comprising:
a conductive polymer with the molecular structure of π-π stacking effect; and
an anti-π-π stacking compound in nanoscale, wherein the anti-π-π stacking compound in nanoscale is dispersed in the molecular structure of the conductive polymer to keep the morphology of the molecular structure of the conductive polymer away from being changed by π-π stacking effect;

wherein the anti-π-π stacking compound will aggregate and move away from the molecular structure of the conductive polymer when the anti-π-π stacking compound contacting with VOC, wherein the morphology of the molecular structure of the conductive polymer will rapidly changed by π-π stacking effect when the anti-π-π stacking compound moving away from the molecular structure of the conductive polymer.

2. The detecting material for detecting VOCs of claim 1 , wherein the conductive polymer is selected from one of the following, the derivatives thereof, or any combinations thereof: poly(3-hexylthiophene) (P3HT), poly(p-phenylene vinylene), polyfluorene, poly(thieno[3,4-b]-thiophene-alt-benzodithiophene), poly(thiophene-alt-isoindigo), poly(cyclopentadithiophene-alt-isoindigo), poly(diketopyrrolopyrrole-alt-4,5-diaza-9,9′-spirobifluorene), {poly(cyclopentadithiophene-alt-benzothiadiazole)}, poly[2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b]dithiophene)-alt-4,7(2,1,3-benzothizdiazle)] (PCPDTBT), and poly(benzodithiophene-thiophene-cyanovinylene) (PCBN).

3. The detecting material for detecting VOCs of claim 1 , wherein said anti-π-π stacking compound is selected from one of the following, or any combinations thereof: inorganic nanomaterials, fullerene derivatives.

4. The detecting material for detecting VOCs of claim 3 , wherein said fullerene derivatives is selected from one of the following, the derivatives thereof, or any combinations thereof: (6,6)-phenyl-C 61 butyric acid methyl ester (PC 61 BM), (6,6)-phenyl-C 71 butyric acid methyl ester (PC 71 BM).

5. The detecting material for detecting VOCs of claim 3 , wherein the weight percentage of the fullerene derivatives and the conductive polymer is 1:5 to 5:1.

6. The detecting material for detecting VOCs of claim 3 , wherein the inorganic nanomaterials is selected from one of the following, the derivatives thereof, or any combinations thereof: copper sulfide, zinc sulfide, bismuth sulfide, cadmium selenide, zinc oxide, tungsten oxide, titanium oxide.

7. The detecting material for detecting VOCs of claim 1 , wherein the weight percentage of the inorganic nanomaterials to the total weight is 1×10 −5 :1 to 1×0 −3 :1.

8. The detecting material for detecting VOCs of claim 1 , wherein the molecular weight of the conductive polymer is 5 to 100 kDa (kilodaltons).

9. A system for detecting volatile organic compounds (VOCs), comprising:
a light providing module for providing full-spectrum light source;
a detecting module located at a first specific location in one optical path of the light providing module to receive the light from the light providing module;
an accommodating space between the light providing module and the detecting module, wherein the accommodating space is employed for introducing and storing the VOC;
a light sensing module located at a second specific location in the same optical path of the light providing module to detect the light variation of the light from the light providing module and across the detecting module, wherein the light sensing module will generate a electric signal based on the light variation; and
an analyzing and controlling module communicating with the light sensing module and receiving the electric signal from the light sensing module, wherein the analyzing and controlling module analyzes the electric signal to identify whether there is VOCs in-situ.

10. A system for detecting VOCs of claim 9 , wherein said light providing module comprises a laser light source or a light emitting diode light source (LED).

11. A system for detecting VOCs of claim 9 , wherein said light providing module comprises a first light source and a second light source, when said detecting module is exposed to the environment with VOCs, the light absorption peak of the first light source is unaffected and being as the control standard value, and the light absorption peak of said second light source is variated with the change the detecting material of the detecting module so that the light absorption peak of the second light source is as the detective variation value.

12. A system for detecting VOCs of claim 11 , wherein the selection of the first light source and the second light source is from one of the following wavelength pair: the wavelength of the first light source at about 510 nm to 520 nm and the wavelength of the second light source about at 550 nm to 610 nm, the wavelength of the first light source at about 545 nm to 585 nm and the wavelength of the second light source at about 630 nm to 650 nm, the wavelength of the first light source at about 690 nm to 700 nm and the wavelength of the second light source at about 745 nm to 755 nm.

13. A system for detecting VOCs of claim 9 , wherein said detecting module comprises a detecting layer, wherein the detecting layer is opposite to the light irradiating direction of the light providing module for receiving the light from the light providing module.

14. A system for detecting VOCs of claim 13 , wherein the thickness range of the detecting layer is about 10 nanometer to 10 micrometer.

15. A system for detecting VOCs of claim 13 , wherein the detectable limitation of the VOCs concentration is depended on controlling the thickness of the detecting layer of the system for detecting VOCs.

16. A system for detecting VOCs of claim 13 , wherein the detecting layer comprises a conductive polymer, and an anti-π-π stacking compound, wherein the anti-π-π stacking compound is in nanoscale, wherein the conductive polymer is with the molecular structure of π-π stacking effect, wherein the anti-π-π stacking compound is dispersed into the molecular structure of the conductive polymer to prevent π-π stacking effect occurred in the conductive polymer, wherein the anti-π-π stacking compound will aggregate and move away from the molecular structure of the conductive polymer when the anti-π-π stacking compound contacting with VOC, wherein the morphology of the molecular structure of the conductive polymer will rapidly changed by π-π stacking effect when the anti-π-π stacking compound moving away from the molecular structure of the conductive polymer.

17. A system for detecting VOCs of claim 16 , wherein the molecular weight of the conductive polymer is about 5 to 100 kDa (kilodaltons).

18. A system for detecting VOCs of claim 16 , wherein the conductive polymer is selected from one of the following, the derivatives thereof, or any combinations thereof: poly(3-hexylthiophene) (P3HT), poly(p-phenylene vinylene), polyfluorene, poly(thieno[3,4-b]-thiophene-alt-benzodithiophene), poly(thiophene-alt-isoindigo), poly(cyclopentadithiophene-alt-isoindigo), poly(diketopyrrolopyrrole-alt-4,5-diaza-9,9′-spirobifluorene), {poly(cyclopentadithiophene-alt-benzothiadiazole)}, poly[2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b′]dithiophene)-alt-4,7(2,1,3-benzothizdiazle)] (PCPDTBT), poly(benzodithiophene-thiophene-cyanovinylene) (PCBN).

19. A system for detecting VOCs of claim 16 , wherein the anti-π-π stacking compound is selected from one of the following, the derivatives thereof, or any combi

Assignees

• Univ Nat Taiwan

Inventors

• Su Wei-Fang
• Hsu Che-Pu
• Lu Chun-Fu
• Liao Hsueh-Chung
• Wu Ming-Chung

Classifications

• G01N33/0047 Primary

  Organic compounds · CPC title