We report a novel solid-state molecular device structure based on double self-assembled monolayers (D-SAM) incorporated into the suspended nanowire architecture to form a "Au vertical bar SAM-1 parallel to SAM-2 vertical bar Au" junction. Using commercially available thiol molecules that are devoid of synthetic difficulty, we constructed a "Au vertical bar S-(CH2)(6)-ferrocerte parallel to SAM-2 vertical bar Au" junction with various lengths and chemical structures of of SAM-2 to tune the coupling between the ferrocene conductive molecular orbital and electrode the junction. Combining low noise and a wide temperature range measurement, we demonstrated systematically modulated conduction depending on the length and chemical nature of SAM-2. Meanwhile, the transport mechanism transition from tunneling to hopping and the intermediate state accompanied by the current fluctuation due to the coexistence of the hopping and tunneling transport channels were observed. Considering the versatility of this solid-state D-SAM in modulating the electrode-molecule interface and electroactive groups, this strategy thus provide a novel facile strategy for tailorable nanoscale charge transport studies and functional molecular devices.