Northwestern University

Jung-Woo T Seo

Mark C Hersam

Alexander A Green

Jian Zhu

Joohoon Kang

Surendra P Shah

Zoi S Metaxa

Alexander Lee Antaris

Ana Carolina Mazarin De Moraes

Maria S Konsta-Gdoutos

The invention relates to printable ion-conductive and viscosity-tunable inks based on two-dimensional (2D) insulators, forming methods and applications of the inks. The 2D insulating material based printable ink includes at least one solvent; and an exfoliated composition dispersed in the at least one solvent. The exfoliated composition includes a 2D insulating material and a dispersant and stabilizing agent. The printed structures of the 2D insulating material based printable ink possess high ionic conductivity, chemical and thermal stability, and electrically insulating character, which are an ideal set of characteristics for printable battery components such as separators and solid electrolytes.

Two-dimensional insulator based printable ion-conductive and viscosity-tunable inks, fabricating methods and applications of same

Printable inks based on a 2D semiconductor, such as MoS, and its applications in fully inkjet-printed optoelectronic devices are disclosed. Specifically, percolating films of MoSnanosheets with superlative electrical conductivity (10s m) are achieved by tailoring the ink formulation and curing conditions. Based on an ethyl cellulose dispersant, the MoSnanosheet ink also offers exceptional viscosity tunability, colloidal stability, and printability on both rigid and flexible substrates. Two distinct classes of photodetectors are fabricated based on the substrate and post-print curing method. While thermal annealing of printed devices on rigid glass substrates leads to a fast photoresponse of 150 μs, photonically annealed devices on flexible polyimide substrates possess high photoresponsivity exceeding 50 mA/W. The photonically annealed photodetector also significantly reduces the curing time down to the millisecond-scale and maintains functionality over 500 bending cycles, thus providing a direct pathway to roll-to-roll manufacturing of next-generation flexible optoelectronics.

Two-dimensional semiconductor based printable optoelectronic inks, fabricating methods and applications of same

Printable inks based on a 2D semiconductor, such as MoS2, and its applications in fully inkjet-printed optoelectronic devices are disclosed. Specifically, percolating films of MoS2 nanosheets with superlative electrical conductivity (10-2 s m&#x2212;1) are achieved by tailoring the ink formulation and curing conditions. Based on an ethyl cellulose dispersant, the MoS2 nanosheet ink also offers exceptional viscosity tunability, colloidal stability, and printability on both rigid and flexible substrates. Two distinct classes of photodetectors are fabricated based on the substrate and post-print curing method. While thermal annealing of printed devices on rigid glass substrates leads to a fast photoresponse of 150 &#x3bc;s, photonically annealed devices on flexible polyimide substrates possess high photoresponsivity exceeding 50 mA/W. The photonically annealed photodetector also significantly reduces the curing time down to the millisecond-scale and maintains functionality over 500 bending cycles, thus providing a direct pathway to roll-to-roll manufacturing of next-generation flexible optoelectronics.

The separation of single-walled carbon nanotubes (SWCNTs), by electronic type, using centrifugation of compositions of SWCNTs and surface active block copolymers in self-forming density gradient media.

Separation of single-walled carbon nanotubes by self-forming density gradient ultracentrifugation

The present teachings provide, in part, methods of separating two-dimensional nanomaterials by atomic layer thickness. In certain embodiments, the present teachings provide methods of generating graphene nanomaterials having a controlled number of atomic layer(s).

Sorting two-dimensional nanomaterials by thickness

Highly concentrated carbon nanotube or other nano-reinforcement suspensions and/or masses are prepared for use as admixtures in cement base materials to make cementitious composite materials.

Growing community of inventors

Evanston, IL, United States of America

Jung-Woo T Seo