Examples of the disclosure provide methods of forming apparatus 21 comprising two or more electrodes 25 and a channel of two dimensional material 23. Providing the discontinuity 29 between the moldable polymer 27 substrate and the layer of two dimensional material 23 prevents the moldable polymer 27 from deforming or otherwise contaminating the layer of two dimensional material 23. This may reduce the number of defects within the layer of two dimensional material 23 which increases carrier mobility within the layer of two dimensional material 23 and provides for an improved apparatus 21.

In some examples the discontinuity 29 may comprise a gas or other fluid which may be configured to prevent contamination of the layer of two dimensional material 23. This may further reduce defects within the layer of two dimensional material 23.

Examples of the disclosure may enable the apparatus 21 to be formed around the layer of two dimensional material 23. This may avoid the need to transfer the layer of two dimensional material 23 which will reduce the chance of the layer of two dimensional material 23 being damaged or otherwise contaminated. As the layer of two dimensional material 23 does not need to be transferred between different substrates this may reduce stresses within the layer which could be formed as the layer is removed from and attached to different substrates. This may also reduce the number of defects within the layer of two dimensional material 23