University of Pennsylvania

Korea University Research and Business Foundation

Korea Institute of Geoscience and Mineral Resources

Soong Ju Oh

Cherie Renee Kagan

Ji-Hyuk Choi

Christopher Bruce Murray

Aaron Thomas Fafarman

Sung-hoon Hong

Yuming Lai

Sangameshwar Rao Saudari

David K Kim

Weon-Kyu Koh

Woo Seok Lee

Han Wang

Dong Gyu Kim

The present disclosure discloses a strain sensor and a method of fabricating the same. The strain sensor according to an embodiment of the present disclosure includes an X-axis sensor formed on a flexible insulating substrate and responsible for sensing X-axis strain; a Y-axis sensor formed on the flexible insulating substrate to be orthogonal to the X-axis sensor and responsible for sensing Y-axis strain; a metal electrode formed on a region of the flexible insulating substrate where the X-axis sensor and the Y-axis sensor are not formed; and an encapsulation layer formed on the X-axis sensor, the Y-axis sensor, and the metal electrode. In this case, the X-axis sensor and the Y-axis sensor have a metal-insulator heterostructure.

Strain sensor and method of fabricating the same

Colloidal nanocrystal electronic devices including multiple types of nanocrystal device elements including nanocrystal metallic electrodes, nanocrystal insulators, and nanocrystal insulators. Colloidal nanocrystal electronic devices may be produced by forming multiple nanocrystal electronic device elements on a substrate.

Electronic colloidal nanocrystal devices

Methods of preparing a dispersion of colloidal nanocrystals (NCs) for use as NC thin films are disclosed. A dispersion of NCs capped with ligands may be mixed with a solution containing chalcogenocyanate (xCN)-based ligands. The mixture may be separated into a supernatant and a flocculate. The flocculate may be dispersed with a solvent to form a subsequent dispersion of NCs capped with xCN-based ligands.

Methods for the preparation of colloidal nanocrystal dispersion

Methods of forming colloidal nanocrystal (NC)-based thin film devicesare disclosed. The methods include the steps of depositing a dispersion of NCs on a substrate to form a NC thin-film, wherein at least a portion of the NCs is capped with chalcogenocyanate (xCN)-based ligands; and doping the NC thin-film with a metal.

Methods of forming colloidal nanocrystal-based thin film devices

Methods of exchanging ligands to form colloidal nanocrystals (NCs) with chalcogenocyanate (xCN)-based ligands and apparatuses using the same are disclosed. The ligands may be exchanged by assembling NCs into a thin film and immersing the thin film in a solution containing xCN-based ligands. The ligands may also be exchanged by mixing a xCN-based solution with a dispersion of NCs, flocculating the mixture, centrifuging the mixture, discarding the supernatant, adding a solvent to the pellet, and dispersing the solvent and pellet to form dispersed NCs with exchanged xCN-ligands. The NCs with xCN-based ligands may be used to form thin film devices and/or other electronic, optoelectronic, and photonic devices. Devices comprising nanocrystal-based thin films and methods for forming such devices are also disclosed. These devices may be constructed by depositing NCs on to a substrate to form an NC thin film and then doping the thin film by evaporation and thermal diffusion.

Methods for preparing colloidal nanocrystal-based thin films

Growing community of inventors

Philadelphia, PA, United States of America

Soong Ju Oh