| Title: | Determination of low solvent concentration by nano-porous silicon photonic sensors using volatile organic compound method |
| Author(s): | Bui H; Pham VH; Pham VD; Hoang THC; Pham TB; Do TC; Ngo QM; Nguyen TV; |
| Address: | "Institute of Materials Science, Vietnam Academy of Science and Technology , Hanoi , Vietnam. Graduate University of Science and Technology, Vietnam Academy of Science and Technology , Hanoi , Vietnam. Thai Nguyen University of Education , Thai Nguyen City , Vietnam" |
| DOI: | 10.1080/09593330.2018.1474268 |
| ISSN/ISBN: | 1479-487X (Electronic) 0959-3330 (Linking) |
| Abstract: | "A vast majority of the organic solvents used in industry and laboratories are volatile, hazardous and toxic organic compounds, they are considered as a potent problem for human health and a cause of environmental pollution. Although analytical laboratory methods can determine extremely low solvent concentration, the sensing method with low cost and high sensitivity remains a conundrum. This paper presents and compares three methods (volatile organic compound (VOC), liquid drop and saturated vapour pressure) for determination of organic solvents in a liquid environment by using photonic sensor based on nano-porous silicon (pSi) microcavity structures. Among those, the VOC method provides the highest sensitivity at low solvent volume concentrations because it can create a high vapour pressure of the analyte on the sensor surface owing to the capillary deposition of the organic solvent into the silicon pores. This VOC method consists of three steps: heating the solution with its particular boiling temperature, controlling the flowing gas through liquid and cooling sensor. It delivers the highest sensitivity of 6.9 nm/% at a concentration of 5% and the limit of detection (LOD) of pSi-sensor is 0.014% in case of ethanol in water when using an optical system with a resolution of 0.1 nm. Especially, the VOC method is capable of detecting low volume concentration of methanol in two tested ethanol solutions of 30% (v/v) and 45% (v/v) with the LOD of pSi-sensor up to 0.01% and 0.04%, respectively. This result will help pave a way to control the quality of contaminated liquor beverages" |
| Keywords: | Humans Limit of Detection Porosity Silicon Solvents *Volatile Organic Compounds Volatile organic compound capillary deposition high sensitivity photonic sensor nano-porous silicon organic solvents; |
| Notes: | "MedlineBui, Huy Pham, Van Hoi Pham, Van Dai Hoang, Thi Hong Cam Pham, Thanh Binh Do, Thuy Chi Ngo, Quang Minh Nguyen, Thuy Van eng England 2018/05/08 Environ Technol. 2019 Nov; 40(26):3403-3411. doi: 10.1080/09593330.2018.1474268. Epub 2018 May 16" |
