Complex structure constituting of several layers of heteroatom-doped N-CDs are used as a main sensing film along with aluminum electrodes in conductometric gas sensing system for sensitive and selective monitoring of CO2 and CO gases diluted with normal air, which are extensively prevalent in the atmosphere primarily due to the industrial revolution, locomotives, and numerous natural phenomena’s and the limit of detection (LOD) turned out to be 400 ppm and 30 ppm, respectively, with 20% relative humidity at 30 °C and pressure 1 (atm) which are good for healthy air quality checks. The sensor performance was satisfactory and bidirectional at ambient room temperature (30 °C) and pressure (1 atm) conditions but the relative humidity (50%) at 30 °C had a detrimental impact on the sensing responses, therefore intermittent heating at 80 °C for several minutes between the sensing responses was provided to the sensing chip or one should use gas filter membranes to block humidity, thereby maintaining its constant performance with great ease and accuracy. The cyclic voltammetry revealed well-defined oxidation and reduction peaks, with excellent stability and reversibility. In a nutshell, heteroatom-doped N-CDs’ nanocomposite material can revolutionize in a better environmental pollution monitoring by sensing gases in an extensively lesser response and recovery times.

Revolutionizing the sensing properties of green carbon dots for monitoring carbon dioxide and carbon monoxide at room temperature
    Abstract
        Graphical Abstract
    1 Introduction
    2 Experimental sections
        2.1 Preparation
    3 Results and discussion
        3.1 Characterization and properties of self-hetero atom-doped N-carbon dots
        3.2 Electrochemical characterization
        3.3 Gas sensing
            3.3.1 Fabrication of conductometric type sensor film
            3.3.2 Gas sensing conditions and setup
            3.3.3 Sensing measurement and performance
            3.3.4 Sensing mechanism
            3.3.5 Effect of 50% relative humidity on sensing performance
    4 Conclusions
    Acknowledgements 
    References

• Mohd Abdullah Sheikh(Bhagwant University, Ajmer, India) Corresponding author
• R. S. Chandok(Sri Guru Tegh Bahadur Khalsa College, Jabalpur, India)
• Abida Bashir(Shaheed Himayun Muzzamil Memorial, Government Degree College, Anantnag, (J & K), India)