**Author details**

in which the nanowires are oriented perpendicular to the first layer was deposited. In the first and second layers, the surface density of the transferred Langmuir monolayer was the same [27]. The surface density is controlled by the surface pressure value. **Figure 8b** shows a

The sheet resistance, *R*s, measured in Ω sq-1 and the transmittance measured at 550 nm are plotted against the surface concentration in **Figure 8c**. Data in **Figure 8c** show that the monolayers at the LD state present high *R*s values which decrease when the surface concen‐ tration increases, while the transmittance value is almost independent on surface concentration and remains constant at 88%. The behavior is opposite for films built from Langmuir mono‐ layers at the HD state. In this case, the sheet resistance is maintained at 8 Ω sq-1 while the transmittance value changes from 65 to 89% when the surface concentration was modified between 345 to 770 mg m-2. According to the resistance and transparency values, our AgNW films can be employed as substitutes for ITO as components of devices such as touch screens, electromagnetic shielding, and defrosted windows [27]. Moreover, our results proved that the Langmuir‐Schaefer methodology is a versatile technique, which allows modifying the transmittance keeping the sheet resistance or tuning the sheet resistance, maintaining the transparency of films constant by properly selecting the surface state and the nanowire mass

Results analyzed in this chapter allow us to discuss the ability of the Langmuir‐Blodgett and Langmuir‐Schaefer methodologies to build thin films of 2D materials such as graphene oxides, transition metal chalcogenide nanoparticles, CdSe Quantum Dots, and silver nanowires. We discuss the advantages of these methods against the most conventional ones such as drop and spin coating for built‐in 2D material films with applications in the fabrication of solar cells,

We also review some strategies for improving the solid coverage, avoiding the nanoparticle aggregation, and modulating the film morphology. All these issues are crucial for increasing the quality of films and to modulate its properties according to the properties required for each

Results analyzed in this chapter indicate that the Langmuir‐Blodgett and Langmuir‐Schaefer methodologies combined with self‐assembled materials can be proposed as a non‐template reproducible technique for patterning at the nanoscale. However, most efforts have to be done for achieving more homogeneous films, higher coverage, and a greater control of the material

The authors thank financial support from the European Regional Development Fund, ERDF, Ministerio de Educación y Ciencia (MAT 2010‐19727), and Ministerio de Economía y Com‐ petitividad (IPT‐2012‐0429‐420000). TA and BMG wish to thank the European Social Fund and Consejería de Educación de la Junta de Castilla y León for their FPI grants. We also thank Ultra‐

arrangements to build good‐quality films to be used in technological applications.

representative FE‐SEM image of a nanowire film obtained by this methodology.

34 Two-dimensional Materials - Synthesis, Characterization and Potential Applications

transferred onto the solid substrate.

LEDs, sensors, and transparent electrodes.

application.

**Acknowledgements**

María Mercedes Velázquez\* , Teresa Alejo, David López‐Díaz, Beatriz Martín‐García and María Dolores Merchán

\*Address all correspondence to: mvsal@usal.es

Department of Physical Chemistry, Faculty of Chemistry, University of Salamanca, Salamanca, Spain
