What happens between the sheets? - EurekAlert
Sep 17, 2020 1 min, 23 secs

In a new study, an Australian-led team has for the first time confirmed what actually happens to those calcium atoms: surprising everyone, the calcium goes underneath both the upper graphene sheet and a lower 'buffer' sheet, 'floating' the graphene on a bed of calcium atoms.

Graphene's properties can be fine-tuned by injection of another material (a process known as 'intercalation') either underneath the graphene, or between two graphene sheets.

This injection of foreign atoms or molecules alters the electronic properties of the graphene by either increasing its conductance, decreasing interactions with the substrate, or both.

Injecting calcium into graphene on a silicon-carbide substrate also creates a high-Tc superconductor, and we always thought we knew where the calcium went in this case too...

Graphene on silicon-carbide has two layers of carbon atoms: one graphene layer on top of another 'buffer layer': a carbon layer (graphene-like in structure) that forms between the graphene and the silicon-carbide substrate during synthesis, and is non-conducting due to being partially bonded to the substrate surface.

"Imagine the silicon carbide is like a mattress with a fitted sheet (the buffer layer bonded to it) and a flat sheet (the graphene)," explains lead author Jimmy Kotsakidis.

Surprisingly, the Monash University-led team found that when injected, the calcium atoms' final destination location instead lies between buffer layer and the underlying silicon-carbide substrate (between the fitted sheet and the mattress!).

Upon injection, the calcium breaks the bonds between the buffer layer and substrate surface, thus, causing the buffer layer to 'float' above the substrate, creating a new, quasi-freestanding bilayer graphene structure (Ca-QFSBLG)!

This result was unanticipated, with extensive previous studies not considering calcium intercalation underneath the buffer layer.


1. Britney Spears ‘Would’ve Had A Baby’ & Gotten Married Already, If Not For Conservatorship - HollywoodLife
Oct 24, 2020 # entertainment 42 secs
2. SEC acknowledges replay error as Ole Miss' Lane Kiffin fined $25K for retweeting officiating critique - ESPN
Oct 27, 2020 # politics 42 secs
3. 2022 GMC Hummer EV revealed: photos, features, and specs - Business Insider - Business Insider
Oct 21, 2020 # politics 21 secs
4. Amber Rose says ex Kanye West bullied her for 10 years - Page Six
Oct 23, 2020 # entertainment 40 secs
5. Scientists Found A New Way To Break Down the Most Common Plastic - Gizmodo
Oct 22, 2020 # science 41 secs
6. AstraZeneca and Johnson & Johnson to resume COVID-19 vaccine trials as U.S. daily cases top 71,000 - CBS News
Oct 24, 2020 # politics 33 secs
7. Chiefs RB Clyde Edwards-Helaire turns in monster day vs. Bills ahead of Le'Veon Bell's arrival - NFL.com
Oct 20, 2020 # politics 1 min, 18 secs
8. Biden says 'it's crass' to attack political opponent's family - Business Insider
Oct 24, 2020 # breaking 36 secs
9. The Arctic hasn’t been this warm for 3 million years - EarthSky
Oct 25, 2020 # science 1 min, 58 secs
10. Hurricane Zeta to become 5th named storm to hit Louisiana in unprecedented season; see latest track - NOLA.com
Oct 26, 2020 # politics 1 min, 47 secs
11. Voting in a Covid Pandemic: Wear a Mask and Bring Your Own Pens - The New York Times
Oct 23, 2020 # health 1 min, 6 secs
12. ‘Fortnite’ Halloween Patch Notes: Midas’ Revenge, Witch’s Brooms, Vaulted Shotgun And Everything You Need To Know - Forbes
Oct 21, 2020 # technology 49 secs
13. Stimulus Bridge, Food Inflation, WTO Leadership Race: Eco Day
Oct 21, 2020 # breaking 5 secs
14. Trump closes his campaign by insulting Fauci for telling the truth
Oct 20, 2020 # breaking 2 mins, 6 secs
15. Samsung chairman Lee Kun-hee dies at 78 - The Verge
Oct 25, 2020 # politics 22 secs
16. Pokemon Crown Tundra Regi Guide: How To Catch Regieleki And Regidrago - GameSpot
Oct 25, 2020 # technology 1 min, 33 secs

SUBSCRIBE

Get monthly updates and free resources.

CONNECT WITH US

© Copyright 2020 365NEWSX - All RIGHTS RESERVED