A plasma system comprising: a plasma device including an active electrode; an ionizable media source configured to supply ionizable media to the plasma device, the ionizable media source coupled to the plasma device at a first connection; a precursor source configured to supply at least one precursor feedstock to the plasma device,; and a power source coupled to the active electrode and configured to ignite the ionizable media and the precursor feedstock at the plasma device to form a plasma volume, wherein: the plasma device includes a dielectric tube and a return electrode disposed on an outer surface thereof, characterised in that the precursor source is coupled to the plasma device at a second connection and an inner surface of the tube is coated by: an optically reflective material that acts as a means to confine photons generated by the plasma; and a reactive material removable from the dielectric tube through tailored plasma driven surface reactions, wherein the first and second connections are coupled to the plasma device at the active electrode such that the at least one precursor feedstock, the removable reactive material and the ionizable media are ignited and mixed concurrently, or wherein the first connection is located upstream of the active electrode and the second connection is coupled to the plasma device at the active electrode to achieve concurrent ignition and mixing of the at least one precursor with the ionizable media. a plasma device including an active electrode; an ionizable media source configured to supply ionizable media to the plasma device, the ionizable media source coupled to the plasma device at a first connection; a precursor source configured to supply at least one precursor feedstock to the plasma device,; and a power source coupled to the active electrode and configured to ignite the ionizable media and the precursor feedstock at the plasma device to form a plasma volume, wherein: the plasma device includes a dielectric tube and a return electrode disposed on an outer surface thereof, characterised in that the precursor source is coupled to the plasma device at a second connection and an inner surface of the tube is coated by: an optically reflective material that acts as a means to confine photons generated by the plasma; and a reactive material removable from the dielectric tube through tailored plasma driven surface reactions, wherein the first and second connections are coupled to the plasma device at the active electrode such that the at least one precursor feedstock, the removable reactive material and the ionizable media are ignited and mixed concurrently, or wherein the first connection is located upstream of the active electrode and the second connection is coupled to the plasma device at the active electrode to achieve concurrent ignition and mixing of the at least one precursor with the ionizable media. the plasma device includes a dielectric tube and a return electrode disposed on an outer surface thereof, characterised in that the precursor source is coupled to the plasma device at a second connection and an inner surface of the tube is coated by: an optically reflective material that acts as a means to confine photons generated by the plasma; and a reactive material removable from the dielectric tube through tailored plasma driven surface reactions, wherein the first and second connections are coupled to the plasma device at the active electrode such that the at least one precursor feedstock, the removable reactive material and the ionizable media are ignited and mixed concurrently, or wherein the first connection is located upstream of the active electrode and the second connection is coupled to the plasma device at the active electrode to achieve concurrent ignition and mixing of the at least one precursor with the ionizable media. an optically reflective material that acts as a means to confine photons generated by the plasma; and a reactive material removable from the dielectric tube through tailored plasma driven surface reactions, wherein the first and second connections are coupled to the plasma device at the active electrode such that the at least one precursor feedstock, the removable reactive material and the ionizable media are ignited and mixed concurrently, or wherein the first connection is located upstream of the active electrode and the second connection is coupled to the plasma device at the active electrode to achieve concurrent ignition and mixing of the at least one precursor with the ionizable media.