Zuleta, Marcelo Yu, Shun Ahmadi, Sareh Boschloo, Gerrit Göthelid, Mats Hagfeldt, Anders Monitoring N719 Dye Configurations on (1 × <i>n</i>)-Reconstructed Anatase (100) by Means of STM: Reversible Configurational Changes upon Illumination We report experimental results concerning the STM imaging of <i>cis</i>-bis (isothiocyanate)-bis-(2,2′-bipyridyl-4,4′dicarboxylate)ruthenium(II)bis(tetrabutylammonium) dye (known as N719) adsorbed on a single crystal of anatase TiO<sub>2</sub>(100). The cleaning pretreatment, by sputtering and annealing, of TiO<sub>2</sub>(100) yields a reproducible (1 × <i>n</i>) surface reconstruction. Previous to dye deposition, TiO<sub>2</sub> was covered with one monolayer of 4-tert-butylpyridine (4-TBP) in ultrahigh vacuum (UHV) in order to protect the surface against air contamination. N719 was subsequently deposited by dipping the crystal into the dye solution. 4-TBP was removed partially in the solution and totally by heating the sample to around 285−300 °C in UHV. The images of the deposited 4-TBP on TiO<sub>2</sub>(100) revealed a complete surface coverage showing three modes of adsorption on TiO<sub>2</sub>. The relatively uncomplicated desorption of 4-TBP enables the accommodation and chemisorption of most N719 molecules directly onto the TiO<sub>2</sub> surface. The STM imaging of N719 was affected, in a reversible way, by illumination, because the quality of the image changed after a few hours in the dark or under illumination conditions. The results presented herein are discussed in terms of changes in molecular configurations and in open circuit potentials. TiO 2 surface;dye;N 719;Reversible Configurational Changes;TBP;UHV;Monitoring N 719 Dye Configurations;N 719 molecules;STM imaging 2010-08-17
    https://acs.figshare.com/articles/journal_contribution/Monitoring_N719_Dye_Configurations_on_1_i_n_i_Reconstructed_Anatase_100_by_Means_of_STM_Reversible_Configurational_Changes_upon_Illumination/2742271
10.1021/la100123q.s001