Summary

Authors have developed, for the first time, the Metal-organic framework (MOF) based textile capacitor sensor having good selectivity toward humidity. Owing to provide high porosity and structural diversity, MOF is one of the sought after active sensing candidates for building gas sensors. Nevertheless, some of the crucial parameters such as poor film formation, low stability against temperature and ambient conditions, and non-availability of gas specific functional groups critically impede the use of MOFs for fabricating highly sensitive and selective gas sensors. The manuscript has considered and carefully resolved some of the aforementioned MOF issues, and successfully integrated them on the challenging textile substrate to realize flexible humidity sensors. However, the manuscript failed to address the effects of mechanical stability on the humidity sensor performance. In addition to this, material characterization results are missing to support their arguments on behalf of sensing performance. Even though the manuscript has certain limitations, it has the immense potential to attract more readers of the flexible gas sensors field. I would like to recommend the article for publication after addressing the following comments.

Merits

1. Besides following the conventional deposition techniques, the manuscript has proposed a maiden attempt to use the Langmuir Blodget method to deposit MOF particles on the challenging textile substrate for fabricating gas sensors.
2. For the first time, the manuscript reveals an unprecedented highly selective humidity sensing performance of the novel MIL-96 MOF particles on the textile substrate.

Comments

1. Page - 2 / Introduction section: Need more clarification regarding the purpose of choosing two specific textile substrates such as linen and cotton for device fabrication and gas sensing characterization.
2. Page - 3 / Results and discussion section: The manuscript highlights "the reason behind improved response from linen when compared to cotton-based humidity response attributed to the uniform coverage of MOF particles on the surface of the former". The provided justification is too generic and may be misleading in many contexts. Hence, more material characterizations accompanied by proper arguments is required to support the claim.
3. Page - 4 / Figure 4b: Please furnish the error bar data for understanding the reliability of the provided stability data of the sensor.
4. Page - 5 / Results and discussion section: Please provide the study details regarding the effect of mechanical stability on both capacitor response and sensor performance.
5. Page-5 / Figure 5: I recommend authors to test the sensor toward the toxic gases such as Nitrogen dioxide (NO2), Sulphur dioxide (SO2), Ammonia (NH3) and Hydrogen sulphide (H2S). Then, include these results in the selectivity study for observing the cross-sensitivity effects on the device sensitivity.
6. To further understand the reported sensing performance, I recommend the authors to comment on the sensing mechanism of the sensor and justify using valid characterization results.