“…5,6,8,9,11,18,19 Deeper discussions on these subjects are beyond the scope of this review, and can be found on the cited literature. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Also, there is recent growing interest in the preparation, stabilization, characterization and application of solids at L/L interfaces, but without any concern for removal to be applied out of the L/L interface: Rao and Kalyanikutty for example reported the stabilization of inorganic nanoparticles (metals, semiconductors and metal oxides) at L/L interfaces and proposed a model for the film growth; 3 Thomas et al also reported the preparation of thin films of similar materials at water/oil interfaces; 4 the application of gold nano-films at L/L interfaces as platforms for redox electrocatalysis, nanoplasmonic sensors and electrovariable optics has been recently reviewed by Scanlon et al; 8 the self-assembly of Janus nanoparticles with different geometries at L/L interfaces was reported by Ruhland et al; 20 the catalytic performance of metal and oxide nanoparticles at L/L interfaces has been demonstrated; 21,22 and Dryfe's group has been publishing very elegant results in recent years on chemical functionalization and electrochemistry involving solids at different L/L interfaces, mainly immiscible electrolyte solutions. [23][24][25][26][27] However, it is important to clarify that this review is focused on the thin film itself and its application in thin film technology, i.e.…”