{"title":"石墨氮化碳中氮空位缺陷对石英晶体微平衡传感器氢气吸附的影响。","authors":"Yasushi Ishiguro, Osuke Uemura, Kazuya Kanasugi, Takashi Tachiki, Kenji Hirakuri","doi":"10.1088/1361-6528/ae0b77","DOIUrl":null,"url":null,"abstract":"<p><p>A graphitic carbon nitride (g-C3N4) with nitrogen-vacancy defects was synthesized by calcination of a mixture of melamine and potassium hydroxide (KOH). The nitrogen/carbon ratio (N/C) of the g-C3N4 film decreased with the addition of KOH, indicating that the KOH addition could control the nitrogen-vacancy defects in the g-C3N4. The g-C3N4 films with nitrogen-vacancy defects were formed on a quartz crystal substrate. The change in the resonant frequency of the crystal was measured before and after the introduction of hydrogen gas, utilizing the quartz crystal microbalance (QCM) method. This approach was employed to characterize the hydrogen sensor effectively. The QCM-type sensor with the defective g-C3N4 film had a different frequency response to the hydrogen than the sensor with pristine g-C3N4 film synthesized without KOH addition. That is, the resonant frequency of the defective g-C3N4 decreased with the introduction of hydrogen, while that of pristine g-C3N4 was observed to increase. The reduced frequency of the defective g-C3N4 is probably due to the formation of chemical bonds with hydrogen (C-H) as observed in the FT-IR measurements. Our findings show that the introduction of nitrogen-vacancy defects into the g-C3N4 significantly impacts the characteristics of QCM-type hydrogen sensors. Moreover, controlling the amount of nitrogen vacancies introduced has a significant effect on the frequency response to the hydrogen gas. The QCM-type sensor utilizing g-C3N4 is anticipated to find applications in a range of gas sensors in the future, contingent upon the progress of research focused on controlling the precise number of nitrogen-vacancy defects.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.8000,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of nitrogen-vacancy defects in graphitic carbon nitride on hydrogen adsorption in quartz-crystal microbalance sensor for hydrogen gas.\",\"authors\":\"Yasushi Ishiguro, Osuke Uemura, Kazuya Kanasugi, Takashi Tachiki, Kenji Hirakuri\",\"doi\":\"10.1088/1361-6528/ae0b77\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>A graphitic carbon nitride (g-C3N4) with nitrogen-vacancy defects was synthesized by calcination of a mixture of melamine and potassium hydroxide (KOH). The nitrogen/carbon ratio (N/C) of the g-C3N4 film decreased with the addition of KOH, indicating that the KOH addition could control the nitrogen-vacancy defects in the g-C3N4. The g-C3N4 films with nitrogen-vacancy defects were formed on a quartz crystal substrate. The change in the resonant frequency of the crystal was measured before and after the introduction of hydrogen gas, utilizing the quartz crystal microbalance (QCM) method. This approach was employed to characterize the hydrogen sensor effectively. The QCM-type sensor with the defective g-C3N4 film had a different frequency response to the hydrogen than the sensor with pristine g-C3N4 film synthesized without KOH addition. That is, the resonant frequency of the defective g-C3N4 decreased with the introduction of hydrogen, while that of pristine g-C3N4 was observed to increase. The reduced frequency of the defective g-C3N4 is probably due to the formation of chemical bonds with hydrogen (C-H) as observed in the FT-IR measurements. Our findings show that the introduction of nitrogen-vacancy defects into the g-C3N4 significantly impacts the characteristics of QCM-type hydrogen sensors. Moreover, controlling the amount of nitrogen vacancies introduced has a significant effect on the frequency response to the hydrogen gas. The QCM-type sensor utilizing g-C3N4 is anticipated to find applications in a range of gas sensors in the future, contingent upon the progress of research focused on controlling the precise number of nitrogen-vacancy defects.</p>\",\"PeriodicalId\":19035,\"journal\":{\"name\":\"Nanotechnology\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":2.8000,\"publicationDate\":\"2025-10-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Nanotechnology\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1088/1361-6528/ae0b77\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nanotechnology","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1088/1361-6528/ae0b77","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Effect of nitrogen-vacancy defects in graphitic carbon nitride on hydrogen adsorption in quartz-crystal microbalance sensor for hydrogen gas.
A graphitic carbon nitride (g-C3N4) with nitrogen-vacancy defects was synthesized by calcination of a mixture of melamine and potassium hydroxide (KOH). The nitrogen/carbon ratio (N/C) of the g-C3N4 film decreased with the addition of KOH, indicating that the KOH addition could control the nitrogen-vacancy defects in the g-C3N4. The g-C3N4 films with nitrogen-vacancy defects were formed on a quartz crystal substrate. The change in the resonant frequency of the crystal was measured before and after the introduction of hydrogen gas, utilizing the quartz crystal microbalance (QCM) method. This approach was employed to characterize the hydrogen sensor effectively. The QCM-type sensor with the defective g-C3N4 film had a different frequency response to the hydrogen than the sensor with pristine g-C3N4 film synthesized without KOH addition. That is, the resonant frequency of the defective g-C3N4 decreased with the introduction of hydrogen, while that of pristine g-C3N4 was observed to increase. The reduced frequency of the defective g-C3N4 is probably due to the formation of chemical bonds with hydrogen (C-H) as observed in the FT-IR measurements. Our findings show that the introduction of nitrogen-vacancy defects into the g-C3N4 significantly impacts the characteristics of QCM-type hydrogen sensors. Moreover, controlling the amount of nitrogen vacancies introduced has a significant effect on the frequency response to the hydrogen gas. The QCM-type sensor utilizing g-C3N4 is anticipated to find applications in a range of gas sensors in the future, contingent upon the progress of research focused on controlling the precise number of nitrogen-vacancy defects.
期刊介绍:
The journal aims to publish papers at the forefront of nanoscale science and technology and especially those of an interdisciplinary nature. Here, nanotechnology is taken to include the ability to individually address, control, and modify structures, materials and devices with nanometre precision, and the synthesis of such structures into systems of micro- and macroscopic dimensions such as MEMS based devices. It encompasses the understanding of the fundamental physics, chemistry, biology and technology of nanometre-scale objects and how such objects can be used in the areas of computation, sensors, nanostructured materials and nano-biotechnology.