Sci. Adv. Today 3 (2017) 25276  
  Research Article  
   
   
         
Development of hybrid nanocomposites sensing elements of SnO2-GOx and SnO2-MWCNTs for efficient detection of NO2 gas  
  Anjali Sharmaa, Monika Tomarb and Vinay Guptac  
     
a Department of Physics, Atma Ram Sanatan Dharma College, University of Delhi, Delhi 110021, India
b Department of Physics, Miranda House, University of Delhi, Delhi 110007, India
c Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India

   
  Abstract  
  Hybrid nano-composite sensor structures of SnO2-modified multiwalled carbon nanotubes (MWCNTs) and graphene oxide (GOx) have been synthesised using chemical route. The prepared SnO2-MWCNT and SnO2-GOx sensors have been exploited for the trace level detection of 100 ppb NO2 gas at lower operating temperature. SnO2-MWCNT sensor was found to exhibit the enhanced sensing response of about 5.4x103 towards 100 ppb NO2 gas at a low operating temperature of 50°C with comparatively faster response and recovery speeds of 2.3 min and 6.8 min respectively as compared to other sensor structures based on thin films of pure SnO2 nanoparticles (response = 1.01 x 102) and SnO2-GOx hybrid nano-composite (5.8x102). Modulation of the space charge regions formed at the interface of n-type semiconducting nanoparticles of SnO2 with p-type MWCNTs and GOx on interaction with the NO2 gas besides providing the conducting channels for the charge carriers in between the p-n junctions are responsible for the observed enhanced response characteristics of the hybrid sensing elements.  
     
   
  Cite this article as:  
  Anjali Sharma, Monika Tomar and Vinay Gupta, Development of hybrid nanocomposites sensing elements of SnO2-GOx and SnO2-MWCNTs for efficient detection of NO2 gas, Sci. Adv. Today 3 (2017) 25276.