NOVELTY - An organic sensing film (140) is designed and synthesized based on chemical routes. The organic sensing film and a guiding layer are deposited on electrodes pre-formed on a piezoelectric substrate. The organic sensing film is then consolidated using thermal-treatment solution(s), to form a gas sensor for detection of gases utilizing a change in mass load and viscoelastic properties of the organic sensing film.    USE - Design and deposition of organic sensing layers for surface acoustic wave chemical sensors (claimed) and bulk acoustic wave chemical sensors used in wireless detection applications, such as for detecting reducing gases (hydrogen, carbon monoxide, methane) and oxidizing gases (nitrogen oxides).    ADVANTAGE - The method enables the use of direct printing method as an additive, mask-less procedure to deposit metallic interdigital transducers and electrodes required for surface acoustic wave devices, along with the deposition of the guiding layer and the organic films only on the location required by the sensing surface acoustic wave principle of the sensor. The reaction between piezoelectric substrate and macrocyclic compound yields a monolayer having quick response, long-term stability, and compact and robust design.    DETAILED DESCRIPTION - An organic sensing film (140) is designed and synthesized based on chemical routes. The organic sensing film and a guiding layer are deposited on electrodes pre-formed on a piezoelectric substrate. The organic sensing film is then consolidated using thermal-treatment solution(s), to form a gas sensor for detection of gases utilizing a change in mass load and viscoelastic properties of the organic sensing film. The organic sensing film is synthesized based on macrocyclic compound(s) (130) covalently bonded to the piezoelectric substrate (120). The macrocyclic compound(s) is bonded to the piezoelectric substrate through alpha , omega -dihaloalkane(s).    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the organic sensing films with macrocyclic compound-based polymers covalently bonded to a piezoelectric quartz substrate.    Piezoelectric substrate (100,120)    Covalent bond (110)    Macrocyclic compound (130)    Organic sensing film (140)