A Monolayer-Based Setup for Optical Amplification

Abstract

Signal amplification has been demonstrated with surface-bound electrochromic complexes that can exist in one of two oxidation states (M2+/3+). Reaction of FeCl3 with covalently immobilized Os2+ complexes on glass substrates converts the metal centers from one oxidation state to the other. The formed Fe2+ reduces a series of Ru3+-based monolayers. The absorption of light is coupled with the oxidation state of the complexes and provides the output for the monolayer-based device. The gain of the setup can be controlled by the addition of a Fe2+ chelating ligand.

Enhancement of Optical and Electrochemical Properties via Bottom-Up Assembly of Binary Oligomer System

“…This value is in good agreement with the previously reported density values for the Ru(II)−polypyridyl complex and pyridyl-ligand-based covalent assembled monolayers. 24,42 Note that this density is below a limit of ∼1.1 × 10 14 metallo-ligands/cm 2 (i.e., ∼0.9 nm 2 /metallo-ligand) given by the cross section of the Ru-PT metallo-ligand so that an even closer packing is, in principle, possible. The full width at half-maximum (fwhm) for the MLCT band of the Ru-PT template layer was estimated at ∼62 nm, which was slightly higher (by 9 nm) than the analogous value obtained for Ru-PT in acetonitrile solution.…”

A Viable Route for Lithium Ion Detection

“…The covalent anchorage of appropriate molecules on suitable inorganic substrates represents one of the most effective approaches towards the construction of hybrid systems, which are valuable for the development of SRMbased devices that display specific single-molecule properties. [3][4][5] When selective analyte recognition is desired, however, strict control of the sensing-agent structure is mandatory to ensure molecular complementarity. [5] As a result, the design of effective sensing agents that retain and possibly enhance their molecular recognition properties at the Università di Bolzano, Piazza Università 5, 39100 Bolzano, Italy spectroscopy to investigate the ionophoric properties of the monolayer, which was found to reversibly recognize and bind lithium ions at ppm levels even in the presence (in a comparable concentration) of highly competitive cations such as Na + .…”

Nerve Gas Simulant Sensing by a Uranyl–Salen Monolayer Covalently Anchored on Quartz Substrates

“…[4][5][6][7][8][9][10][11][12][13] Molecular complementarity betweent he sensing agent andt arget compound assures selective analyte recognition. [14][15][16][17][18][19][20] Nevertheless,t he design of effectives ensing agents that retain and possibly enhance the molecular recognition properties at the solid-state interfacec ontinues to be am ajor challenge. [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] The development of device-quality monolayerbased sensors requires not only selectivity and sensitivity towardsaspecific analyte, but also ah igh degree of stability and af ast nondestructive read-outprocess.…”

“…Molecular films for sensing applications recently attracted much academic and industrial interest . Molecular complementarity between the sensing agent and target compound assures selective analyte recognition …”