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A break in traditional pore morphology approach, is presented here to see itsniche merit over the conventional sensors for water vapour detection. Tubularpores were replaced with normal cone for trace- and inverse cone for RH- leveldetection. The normal conical pore was fabricated by sheer manipulation ofreaction rates of electrolytes, anodic polarization rate and time; and theprocedure made reversed in case of inverse cone structure. Sensor with normalcone geometry exhibits response in ppm level with sensitivity of 13pF/ppm,lower detection limit(LOD)~120 ppm with excellent response/recovery time.Lowering LOD further requires alteration of conical geometric parameters intandem with kinetic theory of water vapour molecules. In contrast, sensordeveloped from inverse conical structure shows response in RH level and LODtouches down to even less than 20 RH% unlike 45 RH% in conventional RH sensors.Linear response characteristics with sensitivity of 5.14 pF/RH%; surprisingly,the limitations such as nonlinear response, large response recovery time andhigh hysteresis as observed in conventional anodic alumina based humiditysensors have been removed. Sensing mechanism in both the structures have beensuitably demonstrated and ratified with experimental data. Trace leveldetection is interpreted with the statistical probabilistic approach in thelight of kinetic theory of gases and Brownian energy. A correlation between topsurface pore diameter (through which water molecule enters) and the optimizedmean free path of vapour molecule is established, and demonstrated itseffectiveness for humidity detection in trace level. Results are encouragingand same concept may be tried for detection of other gaseous stimuli includingorganic vapours.

New Concept in Moisture detection with Unconventional pore morphology Design