Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing optical waveguide formaldehyde gas sensor with high sensitivity and high selectivity

A formaldehyde gas, high selectivity technology, used in instruments, scientific instruments, phase influence characteristics measurement, etc., to achieve high selectivity, fast response recovery, and good reversibility.

Inactive Publication Date: 2011-11-09
XINJIANG UNIVERSITY
View PDF0 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to investigations at home and abroad, LiFe 0.99 Ag 0.01 PO 4 Optical waveguide sensing element with thin film as sensitive layer and its gas sensitivity to formaldehyde gas have not been reported yet

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing optical waveguide formaldehyde gas sensor with high sensitivity and high selectivity
  • Method for preparing optical waveguide formaldehyde gas sensor with high sensitivity and high selectivity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] FeSO 4 ·7H 2 O and H 3 PO 4 and LiOH·H 2 O was mixed at a molar ratio of 1:1:3, and then sequentially added ascorbic acid (0.1 g) and silver nitrate [according to x (Ag): 1-x (LiFePO 4 )], the mixture was moved to a hydrothermal reactor, and the reaction was carried out at 150°C for 15h. After natural cooling, the solid powder in the reaction kettle was collected, washed and filtered with distilled water several times, and then vacuum-dried at 120° C. for 1 h.

[0010] The X-ray diffraction spectrum of the obtained product is completely consistent with the (JCPDS nos.40-1,499) standard spectrum, thus it can be determined that the synthesized product is the olivine structure LiFePO of the orthorhombic Pmnb space group. 4 . It shows that the hydrothermal method can prepare lithium iron phosphate with good crystallinity and high purity.

[0011] Tin-doped glass optical waveguide: buy in stock for future use. [Model: Shitai CITOGLAS., the specification is 76×26×1m...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Wavelengthaaaaaaaaaa
Login to View More

Abstract

Ag-doped LiFePO4 powder is synthesized by a hydrothermal method, and the doped powder is dissolved in a mixed solvent of polyvinyl alcohol and ascorbic acid; and the solution is used as a sensitive reagent for preparing a nano film, the nano film is fixed on the surface of a tin-doped glass optical waveguide (26*26*1mm), and a LiFe0.99Ag0.01PO4 film / tin-doped glass optical waveguide formaldehyde gas sensing device is developed. The sensing device has good selectivity for formaldehyde gas; and the sensitivity of the sensing device is higher than that of various conventional sensing devices, and the lowest concentration capable of being detected by the sensing device can reach 1*10<-4>mg / m<3> (the volume ratio concentration is 10<-10>). The sensing device has the characteristics of reversible response, high response and recovery speeds (less than 2 seconds and 81 seconds respectively), capability of being continuously and repeatedly used and the like.

Description

1. Technical field: [0001] The present invention relates to a LiFe 0.99 Ag 0.01 PO 4 Synthesis of powder, LiFe 0.99 Ag 0.01 PO 4 Preparation of film / glass optical waveguide gas sensor and research on a new method for detecting formaldehyde gas. 2. Background technology: [0002] Formaldehyde (HCHO) is a protoplasmic poison with high toxicity and potential carcinogenicity, and is one of the important indoor pollutants. The World Health Organization (WHO) lists formaldehyde as a potentially dangerous carcinogen and an important environmental pollutant. Formaldehyde in the atmosphere mainly comes from industrial production and widely used plastics, rubber, urea-formaldehyde foam, resins, heat insulation materials, adhesives, leather, textiles, pharmaceuticals, and automobile exhaust. [0003] At present, the sensors for detecting formaldehyde gas in the air at home and abroad mainly include biological formaldehyde sensors (the minimum detection concentration can reach a ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N21/01G01N21/41
Inventor 阿布力孜·伊米提帕提曼·尼扎木丁
Owner XINJIANG UNIVERSITY