fig6

Figure 6. Multi-modal tactile sensors: (A) centralized ionic receptor that can distinguish temperature and strain (reproduced with permission^[111]. Copyright 2020, The American Association for the Advancement of Science); (B) four-layer stacked multifunctional sensor capable of sensing temperature, pressure, and proximity (reproduced with permission^[116]. Copyright 2020, Springer Nature); (C) distributed temperature and strain sensor array (reproduced with permission^[119]. Copyright 2014, American Chemical Society); (D) hybrid electronic skin matrix with stacked and distributed layout (reproduced with permission^[122]. Copyright 2018, Springer Nature).