## 2 Materials and Methods  
Carbon-on-paper substrates were prepared by mechanical mixing of the powder of the active material with a solution of polyvinyl butyral (PVB)--(SDW 3A grade from China Qingdao Hong Jin Chemical Co. LTD, Qingdao, China) in ethanol (96% \(v/v\) from HLR Co., Kiev, Ukraine), which acted as a binder. The polymer content in the composite was 20%. We used the following initial carbon materials for preparation of composites: **graphite KGPS-1--**dry colloidal graphite preparations S-1 from Ltd. Zavallivsky graphite plant, Kirovohrad region, Hayvorskyi district, Zavallia town, Ukraine; **activated carbon--**high-quality activated granulated coconut carbon for filters from Jacobi Carbon Co., Kalmar, Sweden; **carbon black--**grade \"PureBlack@\" from Superior Graphite Co., Chicago, IL, USA; **carbon nanotubes--**_Baytubes C150P_ from _Bayer_ Material-Science AG, Leverkusen, Germany; **DBX-010--**rod-shaped graphite from EnerGraph Inc., Coral Springs, FL, USA. Composites were deposited on Maestro paper (MAESTRO(r) extra 160 g/m\({}^{2}\) from Mondi group, United Kingdom). For better homogenization of the composition during its mixing, ethanol was added as a solvent at the rate of 1 g of solvent per 1 g of solid substance. To eliminate clumping of carbon particles, the pre-mixed composition was placed in an ultrasonic bath (Codyson PS-40A Ultrasonic Cleaner, China). After ultrasonic treatment, the composition was once again subjected to mechanical stirring for 45 min. Using the laboratory electric heat film coating machine (TMAX-TMH from Xiamen Tmax Battery
Preliminary drying of the composition was carried out at room temperature for 60 min. Such processing led to the hardening of the composite material. In order to equalize the thickness and compact the working mass, the samples were passed through rolling mill (8\({}^{\prime\prime}\) width heat calendering machine from Xiamen Tmax Battery Equipments Limited, Xiamen, China), Figure 1b. The samples were cut with a round hole with a diameter of 48 mm. Successive weighing of the substrate and the manufactured sample allowed one to determine the composite mass and calculate the density of the material. Three commercial aromatic pharmaceutical drugs: sulfacyl sodium, Darnitsa company, Kyiv, Ukraine, clonidine hydrochloride, Darnitsa company, Kyiv, Ukraine and cyanocobalamin (vitamin B12), Hebei Huarong Pharmaceutical Co., Ltd., Shijiazhuang, China, used in this study, were purchased at a pharmacy, in tablet form and ampoule [31] (see Table 1). Solid B12, Hebei Huarong Pharmaceutical Co., Ltd., Shijiazhuang, China, was purchased in a chemist's shop to obtain the concentrated B12 solution (to 1.25%) to the contrary pharmaceutical 0.05% solution. It should be noted that the liquid organic medium did not relate to the homogenous medium and its identification as a solution was conditional. These were the mixtures of water and medical materials. The medical materials were in tablet form and contained some additional excipients and ligands, for example, starch, lactose, etc. These components were absent in the molecular formula and are shown in column 4 of Table 1. Due to these factors, some of the solution could be referred to as the suspension. Self-organized organic-inorganic hybrids were formed by a chemical bath deposition of the heterocyclic aromatic compounds at room temperature from water solutions under ambient laboratory conditions. The deposition time was varied from 10 min up to 90 min. The surface morphology of the organic films on carbon substrates was studied using optical microscope MII-4, LOMO, St. Petersburg, Russia, with SLR camera Olympus E-1, Tokyo, Japan. Ag paint (Silver conductivity paint, SCP\(<\) produced by ELECTROLUBE, a division of H.K. Wentworth Limited, Derbyshine, UK), applied to the hybrid as a contact material. Dark and illuminated (30 mW/cm\({}^{2}\)) current-voltage characteristics (CVCs) were measured by Tester 14 TKS-100 (FORM, Voronezh, Russia) with a measurement error of about 0.25%.