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Cross-reactive chemical sensor arrays.

Conventional approaches to chemical sensors have 
traditionally made use of a “lock-and-key” design, 
wherein a specific receptor is synthesized in order to 
strongly and highly selectively bind the analyte of 
interest.1-6 A related approach involves exploiting a 
general physicochemical effect selectively toward a 
single analyte, such as the use of the ionic effect in 
the construction of a pH electrode. In the first 
approach, selectivity is achieved through recognition 
of the analyte at the receptor site, and in the second, 
selectivity is achieved through the transduction 
process in which the method of detection dictates 
which species are sensed. Such approaches are appropriate 
when a specific target compound is to be 
identified in the presence of controlled backgrounds 
and interferences. However, this type of approach 
requires the synthesis of a separate, highly selective 
sensor for each analyte to be detected. In addition, 
this type of approach is not particularly useful for 
analyzing, classifying, or assigning human value 
judgments to the composition of complex vapor 
mixtures such as perfumes, beers, foods, mixtures of 
solvents, etc.