Fig. 5From: A pump-free and high-throughput microfluidic chip for highly sensitive SERS assay of gastric cancer-related circulating tumor DNA via a cascade signal amplification strategyPerformance evaluation of the microfluidic chip. A Digital images of automatic ink flow in microchannels over time. B Digital images of the microfluidic chip applied for target detection. C Two selected regions on the chip and D the corresponding SERS spectraBack to article page