Metal sulfide sub-nanometer clusters formed within calix(8)arene Langmuir-Blodgett films

OZKAYA, Cansu, ABU-ALI, Hisham, NABOK, Alexei, DAVIS, Frank, WALCH, Nik, HAMMOND, Deborah and CAPAN, Rifat (2023). Metal sulfide sub-nanometer clusters formed within calix(8)arene Langmuir-Blodgett films. Thin Solid Films, 782: 140024.

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This work describes the construction of layered Langmuir-Blodgett (LB) films of a calixarene and the use of these as matrices for the synthesis of a range of metal sulfide nanoparticles. CuS, CdS, HgS, and PbS nano-clusters were formed within LB films of an octa-tertbutyl-calix(8)arene substituted with carboxylic acid groups deposited on different substrates (glass, quartz, and silicon) from either: (i) aqueous sub-phases containing 0.5 mM of the respective metal chloride salt (e.g. CuCl2, CdCl2, HgCl2, PbCl2), or (ii) by soaking the LB films in 10 mM solutions of the above salts for 1 h. The formation of metal-sulfide (MeS) nanoparticles was then achieved by exposing samples to H2S gas for 10–12 h. Deposition from salt containing subphases was more reliable and resulted in stoichiometric metal sulfides (CdS, HgS, PbS) being formed within LB films of the calix(8)arene carboxylic acid whereas Cu tended to form polysulfides. UV–vis absorption spectroscopy showed the presence of multiple absorption bands corresponding to electron transitions between energy levels in nanoclusters formed as result of quantum confinement of electrons and holes. The MeS clusters obtained by this process are amongst the smallest reported for LB films, being of the range 0.6–1.2 nm.

Item Type: Article
Uncontrolled Keywords: Langmuir Blodgett films; Calixarenes; Metal sulfides; II-VI semiconductors; Nanoparticles; Size quantization; Energy bandgap; 02 Physical Sciences; 09 Engineering; 10 Technology; Applied Physics; 40 Engineering; 51 Physical sciences
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SWORD Depositor: Symplectic Elements
Depositing User: Symplectic Elements
Date Deposited: 13 Oct 2023 10:17
Last Modified: 24 Oct 2023 09:00

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