New Non-Volaital Memory Platform Built With Covalent Organic Frameworks

Researchers at Institute of Science Tokyo Have Created A New Material Platform For Non-Voolaty Memories Using Covalent Organic Framework (Cofs), Which Are Crystalline Solids with thermal Stability. The Researchers Successfully Installed Electric-Alld-Aresponsive Dipolar Rotors Into Cofs.

Due to the unique structure of the cofs, the diplar rotors can flip in response to an Electric Field without Being Hampered by a Sureic Hindrance from the surroundings, and their orientation can be Helt AM Temperature for a long time, which are negassary conditions for non-volatile memory. The study is Published in the Journal of the American Chemical Society,

Humans have made great efforts to record information by inventing from Media such as Clay, Paper, Compact Disks, and Semiconductor Memories. As the physical entity that holds information – SUCH as Indentations, Characters, PITS, or transistors – Becomes Smaller and its areal density batcomes higher, the information is stored with Higher density. In Rewritable Memories, The Class Called “Non-Volaital Memories” are suitable for storing data for a long time, such as for days and years.

Recently, molecular technology has evolved. One Class of Molecular Technology Consists of Molecules that Exhibit Mons. They are called “Molecular Machines“Or”nanomachines.molecular rotors,

Use of molecular rotors to store information may cause a breakthrough. This is beCAuse the size of molecules is a lesserrs of magnitude smaller than the sizes of pits in a compact disk and transistors in semiconductor memory Designable. Although Applications Using Molecular Machines have been explred extended extended, the attempts to develops non-Volaital Memories Have Been Scarce, Mainly because the simultaneous satnaneous satnae Following Three requests has been so challenging.

1. To control the orientation of molecular rotors with an Electric field, the rotors have to have a Dipole – A Spatial Displacement of a Positive Charge and a Negative Charge Necessary to CAREGESARE to CARCE from the Applied Electric field.
2. The rotors must not flip at Ambient Temperatures So that their orientations are help for a long period.
3. There must be adequate spaces Around the rotors so that they can flip with hamphed by the stereic Hindrance that may be caused by the tight packing of the molecules in the solid phase. Additional, the Substance has to be heat duble up to the temperature current computational components ordinarily undergo, which is often up to 150 ° c.

New Materials Developed by the Researchers of Institute of Science tokyo have achieved these three requisites simultaneously, with very high thermal Durability up to Near 400 ° C. By demonstrating these novelties for the first time, the results have created a material foundation for molecular-machine-based non-Voolaty memories that potentially store information at Higher Density Thean at Higher Density Thean Current Technologies.

The researchers selected covalent organic frameworks (cofs) as a platform for the aim. Cofs are an emerging class of crystalline solids formed by periodically connecting two kinds of building block molecules by covalent bonds. For one building block, they chose a tetrahedral, four-handed molecule. For the other building block, they newly developed a flat, three-handed molecule in which three Dipolar rotors (1,2-diafluorophenyl, dfp) and three aryl groups are alternately positive Central Benzene Ring.

Previous, these aryl groups were shown to suppress the flip of the DFP Rotors at Ambient Temperatures in a Tolune Solution, which satisfied requires 1 and 2 days, but the molecular Solid sterically hindred the flip of the rotors in the solid phase, which could not satisfy requisite 3.

Interestingly, the cofs they developed exhibited an unprecedened Shape Dimorphism, in which the cofs grew to a hexagonal prism shape or a membrane shape, depending on the SOLVENT COMPONT COMPONT COMPE Furthermore, from X-Ray Structural Analyses, these new cofs turned out to have an unprecedented sln topology, which has a low density inharetly and has not been reported for cofs.

“Due to the substantial low density of about 0.2 g/cm³ caused by the unique sln topology positive by the cofs, the dipole rotors incored into the periodic network constituted constituted Suffering from the steeric hindrance from their surroundings.

“This is a breakthrough, because our cofs are a rare solid in which Dipolar rotors can flip when they are brought to elevated temperatureres about 200 ° C or undeergo sufficiently strong Fields, but their orientations can be help for a long time at ambient temperature. This uniquenesses have been realized by our careful selection of the buzz AIM, “Says Professor Yoichi Murakami, The Leader of this project.

Additionally, mukami pointed out the significance of the work also exists in the extension of the diversity of cofs by their discoveries of sln topology and shape dimorphism, bothe of with from without Cofs Previous.

These cof-based solids may be a new platform for storying information with further higher density after proper scale-up and device demonstration are made subsequently.