Xolve (previously Graphene Solutions) was a manufacturer of purified and size selected carbon nanotubes, graphene and nanographene. The company was working to commercialize simple room temperature processing of graphene and other nanoparticle composites, solutions and coatings.
In December 2010, Xolve raised $2 million from both strategic and financial investors. In January 2015 Xolve raised $1.8 million (of a proposed $2.8 million funding round).
XP Nano Material was established in 1998 in china to develop and produce nanomaterials. The company provided graphene, CNTs, nano powders and other materials, but is no longer in business (the web site, nanocnts.com, is not active).
ZapGo, based at Harwell, Oxford, was a UK-based company founded in September 2013. The Company developed ultra-fast charge graphene-enhanced supercapacitors.
ZapGo's supercapacitors are based on a combination of carbon nanotubes and graphene materials, and a proprietary electrolyte. The company developed several generations of its supercapacitor and in 2017 aimed to start commercializing its first products. The company seems no longer to be in business.
ZhongTuo Materials Technology (previously Harbin Mulan), based in China and established in 2012, is engaged in the sale of carbon and graphite materials.
The company provides monolayer flake graphene oxide, monolayer graphene ultra-fine powder, graphene nanoplatelets, graphene oxide membrane (thin film), graphene solutions (dispersible in water, DMF solvent) and more graphene materials.