Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 47, Pages 56485-56497Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c17429
Keywords
ammonia gas sensors; MXene; nitrogen doping; TiO2 homojunctions; humidity tolerance
Funding
- Fundamental and Frontier Research Project of Chongqing [cstc2019jcyj-msxmX0037]
- Major Output Research Topics Project of the Chinese Agricultural Academy of Sciences [CAAS-ZDXT2019002]
- National Natural Science Foundation of China [61704014]
- Fundamental Research Funds for the Central Universities [2019CDYGYB021]
- Joint Fund for Regional Innovation and Development of the National Natural Science Foundation of China [U19A2070]
Ask authors/readers for more resources
In this study, nitrogen-functionalized heterophase TiO2 homojunctions (N-MXene) derived from MXene Ti3C2Tx were prepared and utilized as a sensing layer to detect trace NH3 gas at room temperature. The sensors exhibited improved detection limits and performance compared to existing MXene-involved reports, showing strong responses, sufficient recovery, and fast response/recovery speeds under humid conditions. The incorporation of nitrogen doping and TiO2 homojunctions played a key role in enhancing the performance of the sensors.
In this work, MXene Ti3C2Tx-derived nitrogen- functionalized heterophase TiO2 homojunctions (N-MXene) were prepared via the urea-involved solvothermal treatment with varying reaction time as the sensing layer to detect trace NH3 gas at room temperature (20 degrees C). Compared with no signal for the pristine MXene counterpart, the 18 h-treated sensors (N-MXene-18) achieved a detection limit of 200 ppb with an inspiring response that was 7.3% better than the existing MXeneinvolved reports thus far. Also, decent repeatability, stability, and selectivity were demonstrated. It is noteworthy that the N-MXene-18 sensors delivered a stronger response, more sufficient recovery, and quicker response/recovery speeds under a humid environment than those under dry conditions, proving the significance of humidity. Furthermore, to suppress the effect of the fluctuation of humidity on NH3 sensing during the tests, a commercial waterproof polytetrafluoroethylene (PTFE) membrane was anchored onto the sensing layer, eventually bringing about humidity-independent features. Both nitrogen doping and TiO2 homojunctions constituted by mixed anatase and rutile phases were primarily responsible for the performance improvement with respect to pristine MXene. This work showcases the enormous potential of N-MXene materials in trace NH3 detection and offers an alternative strategy to realize both heteroatom doping and partial oxidation of MXene that is applicable in future optoelectronic devices.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available