A unit being touchable with organism for sensing a vital parameter includes a nanometer-carbon layer and a protection layer. The nanometer-carbon layer transmits a vital signal in response to the vital parameter. The protection layer protects the nanometer-carbon layer.一種用於感測一生理參數的可與生物接觸的單元,其包含一奈米碳層以及一保護層。該奈米碳層響應該生理參數而傳輸一生理訊號。該保護層保護該奈米碳層。