Bimetallic PtCu Nanocrystal Sensitization WO 3 Hollow Spheres for Highly Efficient 3-Hydroxy-2-butanone Biomarker Detection

• Published in: ACS applied materials & interfaces Vol. 12; no. 16; pp. 18904 - 18912
• Main Authors: Wang, Ding, Deng, Lifeng, Cai, Haijie, Yang, Jialin, Bao, Liping, Zhu, Yongheng, Wang, Xianying
• Format: Journal Article
• Language: English
• Published: United States 22.04.2020
• Subjects: Acetoin - analysis; Biomarkers - analysis; Limit of Detection; Listeria monocytogenes - metabolism; Metals, Heavy - chemistry; Nanocomposites - chemistry; Nanoparticles - chemistry; Oxygen - chemistry; Foodborne pathogens detection; Nanocomposites; bimetallic nanocrystal; 3-hydroxy-2-butanone; WO3 hollow spheres
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.0c02523

As a foodborne bacterium, ( ) can cause serious diseases and even death to weak people. 3-Hydroxy-2-butanone (3H-2B) has been proven to be a biomarker for exhalation of LM. Detection of 3H-2B is a fast and effective method for determining whether the food is infected. Herein, we present an excellent 3H-2B gas sensor based on bimetallic PtCu nanocrystal modified WO hollow spheres. The structure and morphology of the PtCu/WO were characterized, and their gas sensitivities were measured by a static testing method. The results showed that the sensor response of WO hollow spheres was enhanced by about 15 times after modification with bimetallic PtCu nanocrystal. The maximum response value of the PtCu/WO sensor to 10 ppm 3H-2B is as high as 221.2 at 110 °C. In addition, the PtCu/WO sensor also exhibited good selectivity to 3H-2B, fast response/recovery time (9 s/28 s), and low limit of detection (LOD < 0.5 ppm). Furthermore, the sensitivity mechanism was studied by monitoring the reaction products by gas chromatography-mass spectrometry. The excellent gas-sensing performance can be attributed to the synergy between PtCu and WO , including the unique spillover effect of O on PtCu nanoparticles, the regulated depletion layer by p-type Cu O to n-type WO , and their selective catalysis to 3H-2B. Hence, this work offers the rational design and synthesis of highly efficient sensitive materials for the detection of for food security.