Details

Autor(en) / Beteiligte

• Song, Bao-Yu
• Zhang, Meng
• Teng, Yang
• Zhang, Xian-Fa
• Deng, Zhao-Peng
• Huo, Li-Hua
• Gao, Shan

Titel

Highly selective ppb-level H2S sensor for spendable detection of exhaled biomarker and pork freshness at low temperature: Mesoporous SnO2 hierarchical architectures derived from waste scallion root

Ist Teil von

• Sensors and actuators. B, Chemical, 2020-03, Vol.307, p.127662, Article 127662

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2020

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• [Display omitted] •Mesoporous SnO2 hierarchical architectures were simply fabricated by using waste scallion root.•The sensor realizes the accurate detection of ppb-level H2S gas under highly humid atmosphere.•The sensor represents the lowest detection limit of 0.5 ppb among all reported SnO2-based sensors.•The sensor has potential applications in pork freshness monitoring and halitosis diagnosing. Herein, we firstly reported a waste scallion root biotemplate strategy to massively fabricate mesoporous SnO2 hierarchical architectures, which can realize precise detection of ppb-level H2S gas in highly humid atmosphere (RH = 85%). The hierarchical skeleton is made up of the crosslinked nanoparticles of about 13 nm with a layer of nanospheres uniformly loaded on the surface of small-sized particles. Such specially structural characteristic can ensure that SnO2 sensing materials possess large specific surface area and good mesoporous connectivity, enhancing the response and selectivity towards trace H2S in a wide range of 0.5–1000 ppb at low working temperature of 92 °C. Especially, detection limit of 0.5 ppb is the lowest among all reported SnO2-based H2S sensors. Meanwhile, we also monitored the change of trace H2S gas concentration in exhaled breath of healthy human, the decay process of fresh pork in 72 h and the simulated environment of halitosis under high humidity, and the sensor exhibited satisfactory results. Therefore, the mesoporous SnO2 hierarchical structure could be used as a spendable sensing material of detecting ppb-level H2S for the applications in meat freshness monitoring and halitosis diagnosis.