Improving the NO<sub>2</sub> Gas Sensing Performances at Room Temperature Based on TiO<sub>2</sub> NTs/rGO Heterojunction Nanocomposites
The development of energy-efficient, sensitive, and reliable gas sensors for monitoring NO<sub>2</sub> concentrations has garnered considerable attention in recent years. In this manuscript, TiO<sub>2</sub> nanotube arrays/reduced graphene oxide nanocomposites with varying rG...
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2024-11-01
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| author | Yan Ling Yunjiang Yu Canxin Tian Changwei Zou |
| author_facet | Yan Ling Yunjiang Yu Canxin Tian Changwei Zou |
| author_sort | Yan Ling |
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| description | The development of energy-efficient, sensitive, and reliable gas sensors for monitoring NO<sub>2</sub> concentrations has garnered considerable attention in recent years. In this manuscript, TiO<sub>2</sub> nanotube arrays/reduced graphene oxide nanocomposites with varying rGO contents (TiO<sub>2</sub> NTs/rGO) were synthesized via a two-step method for room temperature NO<sub>2</sub> gas detection. From SEM and TEM images, it is evident that the rGO sheets not only partially surround the TiO<sub>2</sub> nanotubes but also establish interconnection bridges between adjacent nanotubes, which is anticipated to enhance electron–hole separation by facilitating electron transfer. The optimized TiO<sub>2</sub> NTs/rGO sensor demonstrated a sensitive response of 19.1 to 1 ppm of NO<sub>2</sub>, a 5.26-fold improvement over the undoped TiO<sub>2</sub> sensor. Additionally, rGO doping significantly enhanced the sensor’s response/recovery times, reducing them from 24 s/42 s to 18 s/33 s with just 1 wt.% rGO. These enhancements are attributed to the increased specific surface area, higher concentration of chemisorbed oxygen species, and the formation of p-n heterojunctions between TiO<sub>2</sub> and rGO within the nanocomposites. This study provides valuable insights for the development of TiO<sub>2</sub>/graphene-based gas sensors for detecting oxidizing gases at room temperature. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2024-11-01 |
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| spelling | doaj-art-f86c48d1ab1c4149b6b65ce45235faa22024-11-26T18:16:34ZengMDPI AGNanomaterials2079-49912024-11-011422184410.3390/nano14221844Improving the NO<sub>2</sub> Gas Sensing Performances at Room Temperature Based on TiO<sub>2</sub> NTs/rGO Heterojunction NanocompositesYan Ling0Yunjiang Yu1Canxin Tian2Changwei Zou3Key Laboratory of Advanced Coating and Surface Engineering, Lingnan Normal University, Zhanjiang 524048, ChinaKey Laboratory of Advanced Coating and Surface Engineering, Lingnan Normal University, Zhanjiang 524048, ChinaKey Laboratory of Advanced Coating and Surface Engineering, Lingnan Normal University, Zhanjiang 524048, ChinaKey Laboratory of Advanced Coating and Surface Engineering, Lingnan Normal University, Zhanjiang 524048, ChinaThe development of energy-efficient, sensitive, and reliable gas sensors for monitoring NO<sub>2</sub> concentrations has garnered considerable attention in recent years. In this manuscript, TiO<sub>2</sub> nanotube arrays/reduced graphene oxide nanocomposites with varying rGO contents (TiO<sub>2</sub> NTs/rGO) were synthesized via a two-step method for room temperature NO<sub>2</sub> gas detection. From SEM and TEM images, it is evident that the rGO sheets not only partially surround the TiO<sub>2</sub> nanotubes but also establish interconnection bridges between adjacent nanotubes, which is anticipated to enhance electron–hole separation by facilitating electron transfer. The optimized TiO<sub>2</sub> NTs/rGO sensor demonstrated a sensitive response of 19.1 to 1 ppm of NO<sub>2</sub>, a 5.26-fold improvement over the undoped TiO<sub>2</sub> sensor. Additionally, rGO doping significantly enhanced the sensor’s response/recovery times, reducing them from 24 s/42 s to 18 s/33 s with just 1 wt.% rGO. These enhancements are attributed to the increased specific surface area, higher concentration of chemisorbed oxygen species, and the formation of p-n heterojunctions between TiO<sub>2</sub> and rGO within the nanocomposites. This study provides valuable insights for the development of TiO<sub>2</sub>/graphene-based gas sensors for detecting oxidizing gases at room temperature.https://www.mdpi.com/2079-4991/14/22/1844TiO<sub>2</sub> nanotubesreduced graphene oxideNO<sub>2</sub> gas sensingnanocompositesroom temperature sensors |
| spellingShingle | Yan Ling Yunjiang Yu Canxin Tian Changwei Zou Improving the NO<sub>2</sub> Gas Sensing Performances at Room Temperature Based on TiO<sub>2</sub> NTs/rGO Heterojunction Nanocomposites Nanomaterials TiO<sub>2</sub> nanotubes reduced graphene oxide NO<sub>2</sub> gas sensing nanocomposites room temperature sensors |
| title | Improving the NO<sub>2</sub> Gas Sensing Performances at Room Temperature Based on TiO<sub>2</sub> NTs/rGO Heterojunction Nanocomposites |
| title_full | Improving the NO<sub>2</sub> Gas Sensing Performances at Room Temperature Based on TiO<sub>2</sub> NTs/rGO Heterojunction Nanocomposites |
| title_fullStr | Improving the NO<sub>2</sub> Gas Sensing Performances at Room Temperature Based on TiO<sub>2</sub> NTs/rGO Heterojunction Nanocomposites |
| title_full_unstemmed | Improving the NO<sub>2</sub> Gas Sensing Performances at Room Temperature Based on TiO<sub>2</sub> NTs/rGO Heterojunction Nanocomposites |
| title_short | Improving the NO<sub>2</sub> Gas Sensing Performances at Room Temperature Based on TiO<sub>2</sub> NTs/rGO Heterojunction Nanocomposites |
| title_sort | improving the no sub 2 sub gas sensing performances at room temperature based on tio sub 2 sub nts rgo heterojunction nanocomposites |
| topic | TiO<sub>2</sub> nanotubes reduced graphene oxide NO<sub>2</sub> gas sensing nanocomposites room temperature sensors |
| url | https://www.mdpi.com/2079-4991/14/22/1844 |
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