Farahdiana Wan Yunus, Moataz Mekawy, Edhuan Ismail, Jin Kawakita, Izumi Ichinose
{"title":"使用温控电流传感器芯片直接监测单个氨或挥发性脂肪酸","authors":"Farahdiana Wan Yunus, Moataz Mekawy, Edhuan Ismail, Jin Kawakita, Izumi Ichinose","doi":"10.1016/j.snb.2025.138077","DOIUrl":null,"url":null,"abstract":"<div><div>The detection of ammonia (NH<sub>3</sub>) and volatile fatty acids (VFAs) during anaerobic processes plays an important role in the management of livestock and their waste, as well as in biogas production. A newly developed moisture sensor chip (MSC) was used to monitor these gasses volatized from aqueous solutions. The concentrations of NH<sub>3</sub>, acetic acid (AA), propionic acid (PA), and butyric acid (BA) were in the range 60–150 mM. To substantially improve the detection sensitivity, MSC was cooled from 24 to 19 °C. Because the temperature was decreased, volatized water and solute condensed on the surface of the MSC and the formed microdroplets and the detection current increased to several thousand picoamperes. The detection current also increased with increasing concentration of VFAs and was highly sensitive to the pH conditions and the partial pressure of VFAs in the air phase. The applicable concentration range was from 0 to 150 mM for NH<sub>3</sub> and from 60 to 150 mM for VFAs. The highest sensor sensitivity to NH<sub>3</sub> was 12.3 mM<sup>−1</sup> at 22 °C. The highest sensor sensitivity for AA among VFAs was 4.0 mM<sup>−1</sup> at 19 °C. The amount of water droplets formed on the surface of MSC increased with increasing pH of the aqueous solution in the order NH<sub>3</sub>>water>VFAs. Droplet formation preferentially occurred in the order AA>PA>BA, indicating that a shorter alkyl chain of VFA was preferred. The proposed temperature-controlled MSC is applicable for the detection of NH<sub>3</sub> under basic conditions and for the detection of VFAs under acidic conditions.</div></div>","PeriodicalId":425,"journal":{"name":"Sensors and Actuators B: Chemical","volume":"442 ","pages":"Article 138077"},"PeriodicalIF":3.7000,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Direct monitoring of individual ammonia or volatile fatty acids using a temperature-controlled galvanic sensor chip\",\"authors\":\"Farahdiana Wan Yunus, Moataz Mekawy, Edhuan Ismail, Jin Kawakita, Izumi Ichinose\",\"doi\":\"10.1016/j.snb.2025.138077\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The detection of ammonia (NH<sub>3</sub>) and volatile fatty acids (VFAs) during anaerobic processes plays an important role in the management of livestock and their waste, as well as in biogas production. A newly developed moisture sensor chip (MSC) was used to monitor these gasses volatized from aqueous solutions. The concentrations of NH<sub>3</sub>, acetic acid (AA), propionic acid (PA), and butyric acid (BA) were in the range 60–150 mM. To substantially improve the detection sensitivity, MSC was cooled from 24 to 19 °C. Because the temperature was decreased, volatized water and solute condensed on the surface of the MSC and the formed microdroplets and the detection current increased to several thousand picoamperes. The detection current also increased with increasing concentration of VFAs and was highly sensitive to the pH conditions and the partial pressure of VFAs in the air phase. The applicable concentration range was from 0 to 150 mM for NH<sub>3</sub> and from 60 to 150 mM for VFAs. The highest sensor sensitivity to NH<sub>3</sub> was 12.3 mM<sup>−1</sup> at 22 °C. The highest sensor sensitivity for AA among VFAs was 4.0 mM<sup>−1</sup> at 19 °C. The amount of water droplets formed on the surface of MSC increased with increasing pH of the aqueous solution in the order NH<sub>3</sub>>water>VFAs. Droplet formation preferentially occurred in the order AA>PA>BA, indicating that a shorter alkyl chain of VFA was preferred. The proposed temperature-controlled MSC is applicable for the detection of NH<sub>3</sub> under basic conditions and for the detection of VFAs under acidic conditions.</div></div>\",\"PeriodicalId\":425,\"journal\":{\"name\":\"Sensors and Actuators B: Chemical\",\"volume\":\"442 \",\"pages\":\"Article 138077\"},\"PeriodicalIF\":3.7000,\"publicationDate\":\"2025-05-31\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Sensors and Actuators B: Chemical\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0925400525008536\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, ANALYTICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Sensors and Actuators B: Chemical","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0925400525008536","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
Direct monitoring of individual ammonia or volatile fatty acids using a temperature-controlled galvanic sensor chip
The detection of ammonia (NH3) and volatile fatty acids (VFAs) during anaerobic processes plays an important role in the management of livestock and their waste, as well as in biogas production. A newly developed moisture sensor chip (MSC) was used to monitor these gasses volatized from aqueous solutions. The concentrations of NH3, acetic acid (AA), propionic acid (PA), and butyric acid (BA) were in the range 60–150 mM. To substantially improve the detection sensitivity, MSC was cooled from 24 to 19 °C. Because the temperature was decreased, volatized water and solute condensed on the surface of the MSC and the formed microdroplets and the detection current increased to several thousand picoamperes. The detection current also increased with increasing concentration of VFAs and was highly sensitive to the pH conditions and the partial pressure of VFAs in the air phase. The applicable concentration range was from 0 to 150 mM for NH3 and from 60 to 150 mM for VFAs. The highest sensor sensitivity to NH3 was 12.3 mM−1 at 22 °C. The highest sensor sensitivity for AA among VFAs was 4.0 mM−1 at 19 °C. The amount of water droplets formed on the surface of MSC increased with increasing pH of the aqueous solution in the order NH3>water>VFAs. Droplet formation preferentially occurred in the order AA>PA>BA, indicating that a shorter alkyl chain of VFA was preferred. The proposed temperature-controlled MSC is applicable for the detection of NH3 under basic conditions and for the detection of VFAs under acidic conditions.
期刊介绍:
Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.