Alkoxy substituted arylthiourea derivatives provide excellent electronic properties due to the presence of rigid π-systems within their molecular framework. This study introduces a new thiourea derivative, N-(decyloxyphenyl)-N‘-(4-chlorobenzoyl)thiourea (1A), belongs to the compounds with general formula A-ArC(O)NHC(S)NHAr-D (A is an aryl group containing chloro (-Cl) substituent, in which acts as electron acceptor, while D represented as –OCnH2n+1, the alkoxy chain tail acts as electron donor). Due to its characteristic of D-π-A system, alkoxy thiourea derivatives are applied as a dopant in Carboxymethyl Cellulose (CMC) host material to form a conductive biopolymer solid polymer electrolyte (SPE) film. The formation of a biopolymer-thiourea complex (1A-CMC) has been analyzed through Fourier Transform Infrared (FTIR) spectroscopy and X-ray diffraction (XRD) to determine the interaction between CMC and thiourea derivative in the form of film as well as Electrical Impedance Spectroscopy (EIS) for their ionic conductivity behavior. The highest conductivity at ambient temperature (303K) exhibits 1.44 x 10-7 S cm-1 for CMC-thiourea complexation featuring chloro-substitution (1A). Indeed, biopolymer electrolyte materials featuring thiourea derivative as a dopant has great potential to be developed as an electrical conductor. Due to these findings, these so-called molecular wires candidate has opened wide possibilities to be applied in many microelectronic devices in the near future.