Figure 3.

a) Microfluidic chip for multiplexed detection. b) Cross‐sectional image of microchannels through scanning electron microscope. c) The design of a meandering microchannel. d) Various reagents required are seperated by air spacers in a tube and then automatically and serially deliverd to the microchips. e) The detection steps and the signal amplification by the gold nanoparticles and silver stain. f) Various reagents passed through the detection zone; the signals are monitored in real time. a–f) Reproduced with permission.21 Copyright 2011, Nature Publishing Group.