Abstract
The adsorption of a new cellulose derivative,6-O-(2,3-bis(thiosulfato) propyl-oxy-2-hydroxy-propyl)-cellulose (TSHP), onto silver surfaces was investigated by means of ellipsometry, contact angle measurements and X-ray photoelectron spectroscopy (XPS). The results showed that the formation of a dense TSHP monolayer on silver surfaces is an irreversible and slow process. Based on XPS results a model was proposed to explain the chemisorption of TSHP on silver substrates. This model considers the homolytical cleavage of the thiosulfate groups attached to the cellulose chains with the formation of thio radicals, which bind covalently to the silver surface. The formation of silver thiolates lead to a stable TSHP monolayer on silver surfaces.
Highlights
Metal coating by the adsorption of organic substances is a subject of academic and technological interest
In a previous work[26] we reported on the adsorption of the TSHP on gold surfaces
These values were comparable to those obtained for the adsorption of TSHP onto gold
Summary
Metal coating by the adsorption of organic substances is a subject of academic and technological interest. There are many studies[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16] devoted to the formation of selfassembled monolayers of alkanethiols and alkyl disulfides on metal surfaces. In a previous work[26] we reported on the synthesis of the water soluble 6-O(2,3-bis(thiosulfato)propyl-oxy-2-hydroxy-propyl)-cellulose (TSHP) and its application for gold coating. This new cellulose derivative carries thiosulfato groups along the chain, which attach covalently to the gold surface forming dense, amorphous and stable monolayers[26]. Cellulose has the advantage of being a renewable source and silver is a metal commonly used in technological applications
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