Physicochemical and statistical characterization of gas-sensing behaviors of resonator sensors with carbonaceous films prepared by rf-sputtering of aromatic and hydrophilic biomolecules

Physicochemical and statistical characterization of gas-sensing behaviors of resonator sensors with carbonaceous films prepared by rf-sputtering of aromatic and hydrophilic biomolecules

Blog Article

Quartz crystal resonators coated with gas-sorptive films were characterized by analyzing their structures and their organic gas-sorption behaviors, which were then studied using statistics and computational molecular simulations.The films had carbonaceous structures that were prepared by radio-frequency (rf) sputtering of aromatic biomolecules, such as cytosine and lignin.These films had been compared with the rf-sputtered films of hydrophilic biopolymer of lignin and gelatin.

The composition and morphology of each film governed the organic gas-sorption characteristics of the resonator sensors used for organic gas-sensing.The cytosine film, Support Band which was nitrogen-rich and layered, had a moderate affinity for the larger molecules of normal alcohols and acetate esters.The cytosine film is repulsive to positively-charged moieties of adsorbates.

In contrast, the agarose film, which was nitrogen-poor and columnar, had a high affinity for small adsorbates with short hydrocarbon chains.Molecular flexibility of the adsorbate played an important role in the gas-sorption ability of the agarose film.Molecular dynamics simulation realistic-vibrators clarified that the weakly dipolar adsorbate-aggregate were immiscible in the cytosine adsorbent-aggregate because the collision mixture was prone to be instable.

In practice, the cytosine-sputtered film had a higher gas-sorption ability for weakly dipolar species that have the longer hydrocarbon chains.