02639nas a2200205   4500008004100000245011600041210006900157260000800226300001400234490000600248520193500254653002302189653001402212653001202226653000902238653001102247100002102258700003102279856012302310       2026                        eng d00aFlexible V2O5-x nanobelts as SERS tweezers: defect engineering for remarkably sensitive and selective detection0 aFlexible V2O5x nanobelts as SERS tweezers defect engineering for  cMAY  a8733-87480 v93 a<p>
	Transition metal oxide (TMO)-based semiconductor nanomaterials (NMs) have been progressively explored as promising substrates for surface-enhanced Raman scattering (SERS). The design and synthesis of highly stable, extremely sensitive, exceptionally selective SERS substrates, solely based on defects engineered in TMO-based NMs, have gained significant interest. This work demonstrates a simple hydrothermal route to synthesize substoichiometric V2O5-x flexible nanobelts without the use of surfactants, stabilizing agents, reducing agents, or structure-directing agents. Furthermore, the V2O5-x nanobelts proved to be highly effective as a SERS substrate for the sensitive detection of methylene blue (MB), achieving a remarkable maximum enhancement factor of up to 6.75 &amp; times; 10(9) and a detection limit as low as the picomolar level. This performance is the best among metal oxide semiconductors and is comparable to that of noble metals, even without the presence of a ``hot spot.'' Additionally, the V2O5-x nanobelts demonstrate excellent selectivity as a ``SERS Tweezer,'' enabling the precise detection of MB even in the presence of interfering analytes across binary, ternary, and quinary mixtures. Notably, V2O5-x nanobelts successfully detected melamine and ethephon for the first time using a TMO-based SERS substrate. In addition, the detection limit for SERS using a V2O5-x substrate reached 3 ppm of melamine in liquid milk. Thus, our results clearly demonstrate that metal oxide semiconductors can be transformed into cost-effective, SERS-active substrates through defect engineering. These engineered substrates exhibit high sensitivity, selectivity, stability, recyclability, and biocompatibility-comparable to or even surpassing those of noble metal nanomaterial-based SERS substrates. This advancement could enable their effective use in detecting contaminants in foods and food ingredients.</p>
10adefect engineering10aNanobelts10asensing10aSERS10aV2O5-x1 aKrishnan, Nikhil1 aMukherjee, Shatabdi, Porel  uhttps://library.ncl.res.in/content/flexible-v2o5-x-nanobelts-sers-tweezers-defect-engineering-remarkably-sensitive-and