This year's top five stories -

1. Graphene tackles arsenic

A composite made from reduced graphene oxide and magnetite could help to clean up drinking water.

2. Junctionless transistor makes its debut

When a voltage is applied to the gate, the "squeezing" effect is reduced and current can flow.

3. Graphene supercapacitor breaks storage record

Structures like this may be able to fast-charge mobile electronics.

4. Laser welding boosts efficiency of TiO2 solar cells

Current flow can be greatly improved by welding the inter-electrode interface with a laser.

5. Rapid synthesis of highly stable gold nanoparticles

Researchers in Norway and China have developed a new environmentally friendly route for synthesizing gold nanoparticles in one step at room temperature. The team plans to use the materials for bio-applications.

•  To keep an eye on the latest developments in nanotechnology throughout 2011, sign up to our FREE newswire service and get weekly technology updates sent straight to your inbox. Also, don't forget to check out the Nanotechnology Twitter feed.